commit fa5b0d36d6ebc070b3c82144bebbdac6a0cf96a0
Author: Martin J. Klöckner <martin.cachari@gmail.com>
Date: Sun, 20 Dec 2020 01:03:27 -0300
Created new repository to store all A&PI exercises guides;
Diffstat:
66 files changed, 2120 insertions(+), 0 deletions(-)
diff --git a/README.md b/README.md
@@ -0,0 +1,8 @@
+# ALGORITHMS & PROGRAMATION I (code 9511) - WORKBOOK
+
+"Algorithms and programation I" is a subject from "Facultad de
+Ingenieria de la universidad de Buenos Aires".
+
+In this repository (previous a subfolder from c-repo) I'm gonna
+be storing all my resolved exercies from Martin Cardozo's exercies
+guides (All rights reserved).
diff --git a/clean.sh b/clean.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Removes every a.out from every subfolder where the
+# script is executed;
+
+# Set the filename;
+file='a.out'
+
+# The path where 'file' is gonna be looked for;
+subfolders=./**/$file
+currentdir=./$file
+
+# First checks if the file exist in the current directory
+# or in any sub-folder, if exist removes it from everywhere;
+if [ -e $currentdir ] || [ -e $subfolders ];
+then
+ rm -v -f ./**/"$file"
+ rm -v -f "$file"
+ echo "everithing cleaned succesfully"
+
+# if doesn't exist then does nothing;
+else
+ echo "everything seems clean"
+ echo "there is nothing to do"
+fi
diff --git a/guia01/ej1.c b/guia01/ej1.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+#define DIVISA_NAME_ARS "Pesos"
+#define DIVISA_NAME_BRL "Reales"
+#define DIVISA_NAME_USD "Dolares"
+#define DIVISA_NAME_EUR "Euros"
+
+#define MAX_DIVISAS 4
+
+typedef enum {
+ ARS, BRL, USD, EUR
+} divisa_t;
+
+
+int main( void ) {
+
+ divisa_t divisa_origen = ARS;
+ divisa_t divisa_final = USD;
+
+ float monto_origen, monto_final;
+
+ monto_origen = 1000;
+
+
+
+ float divisas[MAX_DIVISAS][MAX_DIVISAS] = {
+ {1.000, 0.067, 0.012, 0.011}, // ARS
+ {0.067, 1.000, 0.190, 0.160}, // BRL
+ {0.012, 0.190, 1.000, 0.850}, // USD
+ {0.011, 0.160, 0.850, 1.000} // EUR
+ };
+
+ monto_final = (monto_origen * divisas[divisa_origen][divisa_final]);
+ printf("%f\n", monto_final);
+
+ return 0;
+}
+
+
diff --git a/guia01/ej2.c b/guia01/ej2.c
@@ -0,0 +1,15 @@
+/* Calculates the total resistance of a closed circuit */
+
+#include <stdio.h>
+
+#define MAX_RESISTORS 7
+
+int main( void ) {
+
+ int resistor[MAX_RESISTORS];
+
+
+
+
+ return 0;
+}
diff --git a/guia01/ej5.c b/guia01/ej5.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <math.h>
+
+int main( void ) {
+
+ float raiz = 25;
+ float inv = 4;
+
+ printf("sqrt(%.2f) = ", raiz);
+
+ if(raiz > 0)
+ raiz = sqrt(raiz);
+ else
+ return 1;
+
+ printf("%.2f\n", raiz);
+ printf("inv(%.2f) = ", inv);
+
+ if (inv != 0)
+ inv = 1/inv;
+ else
+ return 1;
+
+ printf("%.2f\n", inv);
+
+ return 0;
+}
diff --git a/guia01/ej6.c b/guia01/ej6.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <math.h>
+
+
+int main( void ) {
+
+ int a, b, c;
+ float x1, x2;
+
+ a = 1;
+ b = -12;
+ c = 36;
+
+ x1 = ((-b) + sqrtf( (b*b)-(4*a*c) )) / (2*a);
+ x2 = ((-b) - sqrtf( (b*b)-(4*a*c) )) / (2*a);
+
+ printf("x1 = % .2f\nx2 = % .2f\n", x1, x2);
+
+ return 0;
+}
diff --git a/guia01/ej8.c b/guia01/ej8.c
@@ -0,0 +1,27 @@
+/* Calculates the factorial of a given number. */
+
+#include <stdio.h>
+
+#define ERR_MSG_NEG "ERR: The entered number is negative!"
+
+int main(void) {
+
+ int fact, i, res;
+
+ printf("Enter a number: ");
+ if(scanf("%i", &fact) == EOF)
+ return 1;
+
+ if(fact < 0) {
+ printf(ERR_MSG_NEG"\n");
+ return 1;
+ }
+
+ res = 1;
+ for(i = 1; i <= fact; i++) {
+ res *= i;
+ }
+
+ printf("%d! = %d\n", fact, res);
+ return 0;
+}
diff --git a/guia02/ex01.c b/guia02/ex01.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+typedef enum {
+ FALSE,
+ TRUE
+} bool_t;
+
+int main(void)
+{
+ bool_t isworking = TRUE;
+ printf("%s\n", isworking ? "TRUE" : "FALSE");
+
+ return 0;
+}
+
+
diff --git a/guia02/ex02.c b/guia02/ex02.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+typedef enum {
+ ERROR,
+ OK
+} status_t;
+
+int main(void)
+{
+
+ status_t isworking = OK;
+
+ if (isworking == 1)
+ printf("OK\n");
+ else
+ printf("ERROR\n");
+
+ return 0;
+}
+
+
diff --git a/guia02/ex03.c b/guia02/ex03.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+typedef enum {
+ LUN, MAR, MIE, JUE, VIE, SAB, DOM
+} dia_t;
+
+int main(void)
+{
+ dia_t dia = VIE;
+
+ printf("%d\n", dia);
+
+
+ return 0;
+}
diff --git a/guia02/ex04.c b/guia02/ex04.c
@@ -0,0 +1,79 @@
+/* Ejercicio 4 - Guia 2, Algoritmos y Programacion I - FIUBA */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_INP_LEN 10
+
+typedef enum {
+ FAHRENHEIT,
+ CELSIUS
+} escala_t;
+
+typedef float dato_t;
+
+dato_t ftoc(dato_t fahrenheit)
+{
+ return (((fahrenheit - 32) *5 ) / 9);
+}
+
+dato_t ctof(dato_t celsius)
+{
+ return (((celsius * 9) / 5) + 32);
+}
+
+void title(int i)
+{
+ printf(
+ "---------------------------------------\n"
+ "---------------------------------------\n"
+ "--- %s TO %s CONVERTER ---\n"
+ "---------------------------------------\n"
+ "--- to exit press Ctrl+D ----\n"
+ "---------------------------------------\n"
+ "---------------------------------------\n",
+ i ? "CELSIUS" : "FAHRENHEIT",
+ i ? "FAHRENHEIT" : "CELSIUS"
+ );
+}
+
+void cursor()
+{
+ printf(">> ");
+}
+
+
+
+int main(void)
+{
+ char buffer[MAX_INP_LEN];
+ escala_t c;
+ dato_t i, res;
+ printf("0 - FAHRENHEIT TO CELSIUS\n");
+ printf("1 - CELSIUS TO FAHRENHEIT\n");
+ cursor();
+ c = getchar() - '0';
+ if (c == FAHRENHEIT) {
+ title(FAHRENHEIT);
+ while (fgets(buffer, MAX_INP_LEN, stdin) != NULL) {
+ i = atoi(buffer);
+ res = ftoc(i);
+ printf("%.0f°F = %.2f°C\n", i, res);
+ cursor();
+ }
+ } else if (c == CELSIUS) {
+ title(CELSIUS);
+ while (fgets(buffer, MAX_INP_LEN, stdin) != NULL) {
+ i = atoi(buffer);
+ res = ctof(i);
+ printf("%.0f°C = %.2f°F\n", i, res);
+ cursor();
+ }
+ }
+ printf("\n");
+ return 0;
+}
+
+
+
diff --git a/guia02/ex05.c b/guia02/ex05.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+
+typedef enum {
+ JAN, FEB, MAR, APR, MAY, JUN, JUL, AGO, SEP, OCT, NOV, DEC
+} mes_t;
+
+#define JANUARY "ENERO"
+#define FEBRUARY "FEBRERO"
+#define MARCH "MARZO"
+#define APRIL "ABRIL"
+#define MAYO "MAYO"
+#define JUNE "JUNIO"
+#define JULY "JULIO"
+#define AUGUST "AGOSTO"
+#define SEPTEMBER "SEPTIEMBRE"
+#define OCTOBER "OCTUBRE"
+#define NOVEMBER "NOVIEMBRE"
+#define DECEMBER "DICIEMBRE"
+
+int main(void) {
+ mes_t mes = NOV;
+ switch(mes)
+ {
+ case JAN:
+ printf(JANUARY"\n");
+ break;
+ case FEB:
+ printf(FEBRUARY"\n");
+ break;
+ case MAR:
+ printf(MARCH"\n");
+ break;
+ case APR:
+ printf(APRIL"\n");
+ break;
+ case MAY:
+ printf(MAYO"\n");
+ break;
+ case JUN:
+ printf(JUNE"\n");
+ break;
+ case JUL:
+ printf(JULY"\n");
+ break;
+ case AGO:
+ printf(AUGUST"\n");
+ break;
+ case SEP:
+ printf(SEPTEMBER"\n");
+ break;
+ case OCT:
+ printf(OCTOBER"\n");
+ break;
+ case NOV:
+ printf(NOVEMBER"\n");
+ break;
+ case DEC:
+ printf(DECEMBER"\n");
+ break;
+ }
+ return 0;
+}
diff --git a/guia02/ex06.c b/guia02/ex06.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <ctype.h>
+
+int main(void)
+{
+ int alpha, nonalpha, num;
+ int c;
+
+ alpha = nonalpha = num = 0;
+
+ while((c = getchar()) != EOF ) {
+ if(isalpha(c))
+ alpha++;
+ else if(isdigit(c))
+ num++;
+ else if(!isalnum(c))
+ nonalpha++;
+ }
+ printf(
+ "Alphanumerics: %d\n"
+ "NonAlphanumerics: %d\n"
+ "Digits: %d\n",
+ alpha, nonalpha, num
+ );
+
+ return 0;
+}
diff --git a/guia02/ex07.c b/guia02/ex07.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#define MAX_LEN 5 // max digits of the entered degree;
+#define ERR_MSG_LEN "El angulo ingresado contiene demasiados digitos"
+
+typedef enum {
+ AGUDO, OBTUSO, RECTO
+} angulo_t;
+
+
+void clean(char *buffer)
+{
+ for(size_t i = 0; i < MAX_LEN; i++)
+ buffer[i] = '\0';
+}
+
+
+int main(void) {
+
+ char buffer[MAX_LEN];
+ clean(buffer);
+ int c, d, e, i;
+ i = 0;
+ while(((c = getchar()) != EOF) && c != '\n') {
+ if(i < MAX_LEN) {
+ buffer[i] = c;
+ i++;
+ } else if (i >= MAX_LEN) {
+ fprintf(stderr, ERR_MSG_LEN"\n");
+ return 1;
+ }
+ }
+ d = atoi(buffer);
+
+ if (d < 90)
+ e = AGUDO;
+ else if (d == 90)
+ e = RECTO;
+ else if (d > 90)
+ e = OBTUSO;
+
+
+ switch (e)
+ {
+ case AGUDO:
+ printf("El angulo es AGUDO\n");
+ break;
+ case RECTO:
+ printf("El angulo es RECTO\n");
+ break;
+ case OBTUSO:
+ printf("El angulo es OBTUSO\n");
+ break;
+ }
+ return 0;
+}
+
+
+
+
diff --git a/guia02/ex08.c b/guia02/ex08.c
@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#define MAX_LEN 5 // max digits of the entered degree;
+#define ERR_MSG_LEN "El angulo ingresado contiene demasiados digitos"
+
+#define FST_YR 48
+#define SND_YR 95
+#define TRD_YR 143
+
+
+typedef enum {
+ FIRST, SECOND, THIRD, FOURTH
+} year_t;
+
+
+void clean(char *buffer)
+{
+ for(size_t i = 0; i < MAX_LEN; i++)
+ buffer[i] = '\0';
+}
+
+
+int main(void) {
+
+ char buffer[MAX_LEN];
+ clean(buffer);
+ int c, d, i;
+ year_t e;
+ i = 0;
+ while(((c = getchar()) != EOF) && c != '\n') {
+ if(i < MAX_LEN) {
+ buffer[i] = c;
+ i++;
+ } else if (i >= MAX_LEN) {
+ fprintf(stderr, ERR_MSG_LEN"\n");
+ return 1;
+ }
+ }
+ d = atoi(buffer);
+
+ if (d <= FST_YR)
+ e = FIRST;
+ else if ((d > FST_YR) && (d <= SND_YR))
+ e = SECOND;
+ else if ((d > SND_YR) && d <= (TRD_YR))
+ e = THIRD;
+ else if (d > TRD_YR)
+ e = FOURTH;
+
+
+ switch (e)
+ {
+ case FIRST:
+ printf("Primer año\n");
+ break;
+ case SECOND:
+ printf("Segundo año\n");
+ break;
+ case THIRD:
+ printf("Tercer año\n");
+ break;
+ case FOURTH:
+ printf("Curto año o superior\n");
+ break;
+ }
+ return 0;
+}
+
+
+
+
diff --git a/guia02/ex09.c b/guia02/ex09.c
@@ -0,0 +1,107 @@
+/* Reads a number of credits from stdin and prints the corresponding
+ grade of the Engineer in stdout*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#define MAX_LEN 5 // max digits of the entered degree;
+#define ERR_MSG_LEN "El numero ingresado contiene demasiados digitos"
+#define ERR_NEG_MSG "El numero ingresado no es valido"
+
+#define FST_YR 52
+#define SND_YR 104
+#define TRD_YR 156
+
+#define FST_MSG "Primer año"
+#define SND_MSG "Segundo año"
+#define TRD_MSG "Tercer año"
+#define FTH_MSG "Cuarto año"
+
+typedef enum {
+ FIRST, SECOND, THIRD, FOURTH
+} year_t;
+
+typedef enum {
+ OK, ERROR
+} status_t;
+
+status_t clean(char *buffer)
+{
+ if(buffer == NULL)
+ return ERROR;
+
+ for(size_t i = 0; i < MAX_LEN; i++)
+ buffer[i] = '\0';
+
+ return OK;
+}
+
+
+int main(void) {
+
+ /* Defining variables */
+ char buffer[MAX_LEN];
+ int c, credits, i;
+ year_t year;
+ i = 0;
+
+ /* Cleaning buffer in case it contains a random number */
+ if(clean(buffer) == ERROR)
+ return ERROR;
+
+ /* Reading one char from stdin and storing it on a buffer until EOF */
+ while(((c = getchar()) != EOF) && c != '\n') {
+ if(i < MAX_LEN) {
+ buffer[i] = c;
+ i++;
+ } else if (i >= MAX_LEN) {
+ fprintf(stderr, ERR_MSG_LEN"\n");
+ return 1;
+ }
+ }
+
+ /* Converting the first portion of buffer to int with atoi()
+ and cleaning the buffer */
+ credits = atoi(buffer);
+ if(clean(buffer) == ERROR)
+ return ERROR;
+
+ /* Checks if credits is a valid number */
+ if(credits < 0) {
+ fprintf(stderr, ERR_NEG_MSG"\n");
+ return 1;
+ }
+
+ /* Evaluating the numbers of credits to match the current year */
+ if (credits <= FST_YR)
+ year = FIRST;
+ else if ((credits > FST_YR) && (credits <= SND_YR))
+ year = SECOND;
+ else if ((credits > SND_YR) && (credits <= TRD_YR))
+ year = THIRD;
+ else if (credits > TRD_YR)
+ year = FOURTH;
+
+ /* Printing to stdout the corresponding year */
+ switch (year)
+ {
+ case FIRST:
+ printf(FST_MSG"\n");
+ break;
+ case SECOND:
+ printf(SND_MSG"\n");
+ break;
+ case THIRD:
+ printf(TRD_MSG"\n");
+ break;
+ case FOURTH:
+ printf(FTH_MSG"\n");
+ break;
+ }
+ return OK;
+}
+
+
+
+
diff --git a/guia02/ex10.c b/guia02/ex10.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+
+#define TM "3M Corporation"
+#define MAXWELL "Maxwell Corporation"
+#define SONY "Sony Corporation"
+#define VERBATIM "Verbatim Corporation"
+
+typedef enum {
+ TM_CORPORATION,
+ MAXWELL_CORPORATION,
+ SONY_CORPORATION,
+ VERBATIM_CORPORATION
+} manufacturer_t;
+
+
+int main(void) {
+ manufacturer_t c;
+ printf("Introduzca un Id. de fabricante: ");
+ c = (getchar() - '0');
+ switch(c) {
+ case TM_CORPORATION:
+ printf(TM"\n");
+ break;
+ case MAXWELL_CORPORATION:
+ printf(MAXWELL"\n");
+ break;
+ case SONY_CORPORATION:
+ printf(SONY"\n");
+ break;
+ case VERBATIM_CORPORATION:
+ printf(VERBATIM"\n");
+ break;
+ default:
+ printf("El numero ingresado no es valido\n");
+ return 1;
+ }
+ return 0;
+}
diff --git a/guia02/ex11.c b/guia02/ex11.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+
+#define TM "3M Corporation"
+#define MAXWELL "Maxwell Corporation"
+#define SONY "Sony Corporation"
+#define VERBATIM "Verbatim Corporation"
+
+typedef enum {
+ TM_CORPORATION = '3',
+ MAXWELL_CORPORATION = 'M',
+ SONY_CORPORATION = 'S',
+ VERBATIM_CORPORATION = 'V'
+} manufacturer_t;
+
+
+int main(void) {
+ manufacturer_t c;
+ printf("Introduzca un Id. de fabricante: ");
+ c = getchar();
+ switch(c) {
+ case TM_CORPORATION:
+ printf(TM"\n");
+ break;
+ case MAXWELL_CORPORATION:
+ printf(MAXWELL"\n");
+ break;
+ case SONY_CORPORATION:
+ printf(SONY"\n");
+ break;
+ case VERBATIM_CORPORATION:
+ printf(VERBATIM"\n");
+ break;
+ default:
+ printf("El numero ingresado no es valido\n");
+ return 1;
+ }
+ return 0;
+}
diff --git a/guia02/ex14.c b/guia02/ex14.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+typedef enum {
+ 1200, 2400, 4800, 9600
+} baudrate_t;
+
+int main(void)
+{
+ baudrate_t baudrate = 9600;
+ return 0;
+}
diff --git a/guia02/ex16.c b/guia02/ex16.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+#define TRUE 0
+
+#ifdef TRUE
+ #undef TRUE
+ #define TRUE 1
+#endif
+
+int main(void)
+{
+ printf("TRUE = %d\n", TRUE);
+ return 0;
+}
+
+
diff --git a/guia02/ex17.c b/guia02/ex17.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int main(void)
+{
+ #ifdef DEBUG
+ printf("DEBUGGING\n");
+ #endif
+
+ printf("Hello world!\n");
+
+ return 0;
+}
diff --git a/guia02/ex18.c b/guia02/ex18.c
@@ -0,0 +1,92 @@
+#include <stdio.h>
+
+#define LANGUAGE GER // Define language in which month are displyed ESP,GER,ENG
+
+#if LANGUAGE == ESP
+ #define JANUARY "ENERO"
+ #define FEBRUARY "FEBRERO"
+ #define MARCH "MARZO"
+ #define APRIL "ABRIL"
+ #define MAYO "MAYO"
+ #define JUNE "JUNIO"
+ #define JULY "JULIO"
+ #define AUGUST "AGOSTO"
+ #define SEPTEMBER "SEPTIEMBRE"
+ #define OCTOBER "OCTUBRE"
+ #define NOVEMBER "NOVIEMBRE"
+ #define DECEMBER "DICIEMBRE"
+#elif LANGUAGE == GER
+ #define JANUARY "JANUAR"
+ #define FEBRUARY "FEBRUAR"
+ #define MARCH "MÄRZ"
+ #define APRIL "APRIL"
+ #define MAYO "MAI"
+ #define JUNE "JUNI"
+ #define JULY "JULI"
+ #define AUGUST "AUGUST"
+ #define SEPTEMBER "SEPTEMBER"
+ #define OCTOBER "OKTOBER"
+ #define NOVEMBER "NOVEMBER"
+ #define DECEMBER "DEZEMBER"
+#else
+ #define JANUARY "JANUARY"
+ #define FEBRUARY "FEBRUARY"
+ #define MARCH "MARCH"
+ #define APRIL "ABPRIL"
+ #define MAYO "MAY"
+ #define JUNE "JUNE"
+ #define JULY "JULY"
+ #define AUGUST "AUGUST"
+ #define SEPTEMBER "SEPTEMBER"
+ #define OCTOBER "OCTOBER"
+ #define NOVEMBER "NOVEMBER"
+ #define DECEMBER "DECEMBER"
+#endif
+
+typedef enum {
+ JAN, FEB, MAR, APR, MAY, JUN, JUL, AGO, SEP, OCT, NOV, DEC
+} mes_t;
+
+int main(void) {
+ mes_t mes = MAR;
+ switch(mes)
+ {
+ case JAN:
+ printf(JANUARY"\n");
+ break;
+ case FEB:
+ printf(FEBRUARY"\n");
+ break;
+ case MAR:
+ printf(MARCH"\n");
+ break;
+ case APR:
+ printf(APRIL"\n");
+ break;
+ case MAY:
+ printf(MAYO"\n");
+ break;
+ case JUN:
+ printf(JUNE"\n");
+ break;
+ case JUL:
+ printf(JULY"\n");
+ break;
+ case AGO:
+ printf(AUGUST"\n");
+ break;
+ case SEP:
+ printf(SEPTEMBER"\n");
+ break;
+ case OCT:
+ printf(OCTOBER"\n");
+ break;
+ case NOV:
+ printf(NOVEMBER"\n");
+ break;
+ case DEC:
+ printf(DECEMBER"\n");
+ break;
+ }
+ return 0;
+}
diff --git a/guia03/a.out b/guia03/a.out
Binary files differ.
diff --git a/guia03/ex01.c b/guia03/ex01.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+#define MAX_LEN 100
+
+
+int main(void) {
+
+ char s[MAX_LEN];
+
+ printf("> ");
+ scanf("%s", s);
+ puts(s);
+
+ printf("> ");
+ // gets(s); removed from std C11 because it's very unsecure
+ fgets(s, MAX_LEN, stdin);
+ puts(s);
+
+ return 0;
+}
diff --git a/guia03/ex02.c b/guia03/ex02.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_LEN 100
+#define ERR_EMPTY_MSG "no chars have been readed"
+
+int main(void) {
+
+ char s[MAX_LEN];
+ if(fgets(s, MAX_LEN, stdin) == NULL) {
+ fprintf(stderr, ERR_EMPTY_MSG"\n");
+ return 1;
+ } else if(strcmp(s, "") == 0) {
+ fprintf(stderr, ERR_EMPTY_MSG"\n");
+ return 1;
+ }
+ printf("%s", s);
+ return 0;
+}
diff --git a/guia03/ex04.c b/guia03/ex04.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <string.h>
+
+int main(void) {
+
+ char s[] = "Hello world!\n";
+ char aux;
+ int n;
+
+ for(n = strlen(s); n >= 0; n--) {
+ aux = s[n];
+ if(aux != '\n')
+ putchar(aux);
+ }
+ putchar('\n');
+ return 0;
+}
diff --git a/guia03/ex05.c b/guia03/ex05.c
@@ -0,0 +1,14 @@
+/* Calculates the length of a string and prints it on stdout */
+
+#include <stdio.h>
+
+int main(void) {
+
+ char s[] = "Hello world!\n";
+ int i;
+ for(i = 0; s[i] != '\0'; i++) {
+ }
+ printf("%d\n", i);
+
+ return 0;
+}
diff --git a/guia03/ex06.c b/guia03/ex06.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <string.h>
+
+
+
+int main(void) {
+
+ char origen[] = "Hello world!\n";
+ size_t i, len;
+ len = strlen(origen);
+ char destino[len];
+
+ for(i = 0; i <= len; i++) {
+ destino[i] = origen[i];
+ if(i == len)
+ destino[i + 1] = '\0';
+ }
+
+ printf("%s", origen);
+ printf("%s", destino);
+
+
+ return 0;
+}
diff --git a/guia03/ex07.c b/guia03/ex07.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <string.h>
+
+
+int main(void) {
+
+ char s1[] = "Hello world!";
+ char s2[] = "Hola mundo!";
+
+
+ int i, s1_len, s2_len, cat_len;
+ s1_len = strlen(s1);
+ s2_len = strlen(s2);
+
+ cat_len = ((s1_len + s2_len) + 1); // One more for the '\0' byte;
+ char cat[cat_len];
+
+ for(i = 0; i <= cat_len; i++) {
+ if (i < s1_len) {
+ cat[i] = s1[i];
+ } else if (i >= s1_len) {
+ cat[i] = s2[i - s1_len];
+ } else if (i == cat_len) {
+ cat[i + 1] = '\0';
+ }
+ }
+ printf("%s\n", cat);
+ return 0;
+}
diff --git a/guia03/ex08.c b/guia03/ex08.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <string.h>
+
+size_t str_len(const char *str) {
+ if(str == NULL)
+ return 1;
+
+ size_t i;
+ for(i = 0; str[i] != '\0'; i++)
+ ;
+
+ return i;
+}
+
+int main(void) {
+
+ char s1[] = "ABC";
+ char s2[] = "ABC";
+
+ size_t s1_len, s2_len;
+ int i, j, cmp;
+
+ s1_len = str_len(s1);
+ s2_len = str_len(s2);
+
+ j = (s1_len > s2_len) ? s1_len : s2_len;
+
+ for(i = 0, cmp = 0; i < j; i++) {
+ if(s1[i] < s2[i]) {
+ cmp -= (s2[i] - s1[i]);
+ } else
+ if (s1[i] > s2[i]) {
+ cmp += (s1[i] - s2[i]);
+ }
+ }
+ printf("%d\n", cmp);
+ return 0;
+}
diff --git a/guia03/ex08_modular.c b/guia03/ex08_modular.c
@@ -0,0 +1,66 @@
+/* Makes a lexicographical comparison between two strings */
+/* similar to strcmp() function from <string.h> */
+
+#include <stdio.h>
+
+/* This function calculates the length of given string
+ and returns the lenghth by its name as a size_t */
+size_t str_len(const char *str)
+{
+ if(str == NULL)
+ return 1;
+ size_t i;
+ for(i = 0; str[i] != '\0'; i++)
+ ;
+
+ return i;
+}
+
+/* This function is equivalent to strcmp() function from
+ <string.h> library */
+int str_cmp(const char *str1, const char *str2)
+{
+// In case one of the given strings is NULL returns 1;
+ if(str1 == NULL || str2 == NULL)
+ return 1;
+
+
+ char aux1, aux2;
+ int i, j, cmp, str1_len, str2_len;
+ str1_len = str_len(str1);
+ str2_len = str_len(str2);
+
+// Assigns the length of the longer string to j;
+ j = (str1_len > str2_len) ? str1_len : str2_len;
+
+// The for loop itinirate until the longest str ENDs
+ for(i = 0, cmp = 0; i < j; i++) {
+
+ aux1 = str1[i];
+ aux2 = str2[i];
+
+// This statement assigns to cmp the difference between
+// the two coresponding chars of str1 and str2
+ if(aux1 < aux2) {
+ cmp -= (aux2 - aux1);
+ } else if (aux1 > aux2) {
+ cmp += (aux1 - aux2);
+ }
+
+ }
+ return cmp;
+}
+
+
+int main(void) {
+
+ char s1[] = "AB";
+ char s2[] = "ABC";
+
+ int i, j;
+ i = str_cmp(s1, s2);
+
+ printf("%d\n", i);
+
+ return 0;
+}
diff --git a/guia03/ex09_modular.c b/guia03/ex09_modular.c
@@ -0,0 +1,60 @@
+/* Makes a lexicographical comparison between the first n */
+/* numbers of two given strings */
+/* similar to strncmp() function from <string.h> */
+
+#include <stdio.h>
+
+/* This function calculates the length of given string
+ and returns it by its name, equivalent to strlen()
+ function from <string.h> library */
+size_t str_len(const char *str)
+{
+ if(str == NULL)
+ return 1;
+
+ size_t i;
+ for(i = 0; str[i] != '\0'; i++)
+ ;
+
+ return i;
+}
+
+/* This function is equivalent to strncmp() function from
+ <string.h> library */
+int str_cmp(const char *str1, const char *str2, size_t n)
+{
+ if(str1 == NULL || str2 == NULL)
+ return 1;
+
+ char aux1, aux2;
+ int i, j, cmp, str1_len, str2_len;
+ str1_len = str_len(str1);
+ str2_len = str_len(str2);
+
+ if(n > str1_len || n > str2_len)
+ return 1;
+
+ for(i = 0, cmp = 0; i <= n; i++) {
+ aux1 = str1[i];
+ aux2 = str2[i];
+ if(aux1 < aux2) {
+ cmp -= (aux2 - aux1);
+ } else if (aux1 > aux2) {
+ cmp += (aux1 - aux2);
+ }
+ }
+ return cmp;
+}
+
+
+int main(void) {
+
+ char s1[] = "AB ";
+ char s2[] = "ABC";
+
+ int i;
+ i = str_cmp(s1, s2, 4);
+
+ printf("%d\n", i);
+ return 0;
+}
diff --git a/guia03/ex10.c b/guia03/ex10.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <string.h>
+
+
+
+int main(void) {
+
+ char src[] = "Hello world!\n";
+ size_t i, n;
+
+ n = 12;
+ char cpy[n];
+
+ for(i = 0; i <= n; i++) {
+ cpy[i] = src[i];
+ }
+
+ printf("%s", src);
+ printf("%s", cpy);
+
+
+ return 0;
+}
diff --git a/guia03/ex11.c b/guia03/ex11.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <ctype.h>
+
+int main(void)
+{
+ char str[] = "hello world";
+ int i;
+ char aux;
+
+ for(i = 0; (aux = str[i]) != '\0'; i++)
+ if(islower(aux))
+ str[i] = toupper(aux);
+
+ printf("%s\n", str);
+ return 0;
+}
+
+
+
diff --git a/guia03/ex12.c b/guia03/ex12.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <ctype.h>
+
+int main(void)
+{
+ char str[] = "HELLO WORLD";
+ int i;
+ char aux;
+
+ for(i = 0; (aux = str[i]) != '\0'; i++)
+ if(isupper(aux))
+ str[i] = tolower(aux);
+
+ printf("%s\n", str);
+ return 0;
+}
+
+
+
diff --git a/guia03/ex13.c b/guia03/ex13.c
@@ -0,0 +1,61 @@
+// Reads a string from stdin and converts it to uppercase or lowercase
+// depending on an option readed from stdin
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#define MSG_STR_PROMPT "Introduzca una cadena:"
+#define MSG_FMT_PROMPT "Convertir a: (0 - MAYUSCULAS / 1 - MINUSCULAS)"
+#define MSG_FMT_ERR "Err: Formato incorrecto"
+
+#define MAX_STR_LEN 100
+
+typedef enum {
+ FMT_MAYUSCULAS, FMT_MINUSCULAS
+} format_t;
+
+
+int main ( void ) {
+
+
+ char buffer[MAX_STR_LEN];
+ char str[MAX_STR_LEN];
+ format_t format;
+
+
+ printf(MSG_STR_PROMPT"\n>> ");
+ fgets(buffer, MAX_STR_LEN, stdin);
+ strcpy(str, buffer);
+
+ printf(MSG_FMT_PROMPT"\n>> ");
+ format = (getchar () - '0');
+ if((format < 0) || (format > 1)) {
+ fprintf(stderr, MSG_FMT_ERR"\n");
+ return 1;
+ }
+
+ printf("La cadena ingresada: %sOpcion elegida: %d\n", str, format);
+
+ int i, aux;
+ switch(format)
+ {
+ case FMT_MAYUSCULAS:
+ for(i = 0; (aux = str[i]) != '\n'; i++) {
+ if(islower(aux))
+ str[i] = toupper(aux);
+ }
+ break;
+ case FMT_MINUSCULAS:
+ for(i = 0; (aux = str[i]) != '\n'; i++) {
+ if(isupper(aux))
+ str[i] = tolower(aux);
+ }
+ break;
+ }
+
+ printf("%s", str);
+ return 0;
+}
diff --git a/guia03/ex14.c b/guia03/ex14.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+
+
+typedef enum {
+ OK, ERROR
+} status_t;
+
+
+size_t rechar(char *str, char old, char new);
+
+
+int main( void ) {
+
+ char str[] = "Hello world!";
+
+ rechar(str, 'o', 'e');
+
+ printf("%s\n", str);
+ return OK;
+}
+
+
+
+size_t rechar(char *str, char old, char new) {
+ if(str == NULL)
+ return ERROR;
+
+ int i;
+ for(i = 0; str[i] != '\0'; i++) {
+ if(str[i] == old) {
+ str[i] = new;
+ }
+ }
+ return OK;
+}
diff --git a/guia03/ex15.c b/guia03/ex15.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+#define MAX_LEN 100
+
+int main(void) {
+
+ int i, j;
+ char str[MAX_LEN];
+
+ fgets(str, MAX_LEN, stdin);
+
+ j = 0;
+ while(str[j] == ' ')
+ j++;
+
+ for(i = 0; str[i] != '\0'; i++) {
+ str[i] = str[i + j];
+ }
+ puts(str);
+ return 0;
+}
diff --git a/guia03/ex16.c b/guia03/ex16.c
@@ -0,0 +1,28 @@
+// Reads a string from stdin and if it ends in blank
+// spaces it erase them and moves the '\n', '\0' chars
+// it performs a "right trim"
+
+
+#include <stdio.h>
+
+#define MAX_LEN 100
+
+
+int main ( void ) {
+
+ int i, j, k;
+ char str[MAX_LEN];
+
+ if(fgets(str, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ for(i = 0; str[i] != '\0'; i++)
+ if(str[i + 1] == '\n')
+ for(j = 0; str[i - j] == ' '; j++)
+ ;
+
+ str[(i - j) - 1] = str[i - 1];
+ str[(i - j)] = '\0';
+
+ return 0;
+}
diff --git a/guia03/ex17.c b/guia03/ex17.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_LEN 100
+
+
+int main ( void ) {
+
+ int i, j;
+
+ char s1[MAX_LEN];
+ char s2[MAX_LEN];
+
+ if(fgets(s1, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ if(fgets(s2, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ if(strlen(s2) > strlen(s1))
+ return 1;
+
+ for(i = 0; s1[i] != '\0'; i++)
+ if(s1[i] == s2[0])
+ for(j = 0; (s2[j] != '\0'); j++)
+ if(s1[i] == s2[j]) {
+ putchar(s1[i]);
+ i++;
+ }
+ putchar('\n');
+ return 0;
+}
+
+
diff --git a/guia03/ex18.c b/guia03/ex18.c
@@ -0,0 +1,57 @@
+// Reads a string of chars from stdin and check if it's
+// a palindrome.
+
+#include <stdio.h>
+#include <ctype.h>
+
+#define MAX_LEN 100
+
+
+int main ( void ) {
+
+ char str[MAX_LEN];
+ int aux, len, i, j;
+
+ if(fgets(str, MAX_LEN, stdin) == NULL)
+ return 1;
+
+// Converts all the string to lowercase;
+ for(i = 0; str[i] != '\0'; i++)
+ if(isupper(str[i]))
+ str[i] = tolower(str[i]);
+
+// If the readed string it's a sentence, erases all
+// the blank spaces between the words;
+ for(i = 0; str[i] != '\0'; i++) {
+ if(str[i] == ' ') {
+ aux = i;
+ while(str[aux] != '\0') {
+ str[aux] = str[aux + 1];
+ aux++;
+ }
+ }
+ }
+
+// Counts the length of the string;
+ for(i = 0; str[i] != '\n'; i++)
+ ;
+
+// Stored the lengh of the string for later,
+// and subtract one from i because of the last char;
+ len = i;
+ i = (i - 1);
+
+// This part compares one by one the chars from the
+// string, first with last, second with before last,
+// and so on, only comparing the next one if the previous
+// one was equal;
+ for(j = 0; (str[j] == str[i]) && (str[j] != '\0'); j++, i--)
+ ;
+
+// If the string or sentence its palindrome, then in the previous
+// block j would end with the value of the lengh, stored previously;
+ if(j == len)
+ printf("La cadena es capicua.\n");
+
+ return 0;
+}
diff --git a/guia03/ex20.c b/guia03/ex20.c
@@ -0,0 +1,24 @@
+// Reads a string of chars from stdin and converts
+// it to a number, int or float;
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+
+int main ( void ) {
+
+ char buffer[MAX_LEN];
+ int num1;
+ float num2;
+
+ fgets(buffer, MAX_LEN, stdin);
+ num1 = atoi(buffer);
+ printf("n1(int) = %d\n", num1);
+
+ fgets(buffer, MAX_LEN, stdin);
+ num2 = atof(buffer);
+ printf("n2(float) = %.2f\n", num2);
+
+ return 0;
+}
diff --git a/guia03/ex21.c b/guia03/ex21.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+
+int main ( void ) {
+
+ char buffer[MAX_LEN];
+ float num;
+ char num2[MAX_LEN];
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ num = atof(buffer);
+ sprintf(num2, "%.2f\n", num);
+
+ printf("%s", num2);
+ return 0;
+}
diff --git a/guia03/ex22.c b/guia03/ex22.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+
+int main ( void ) {
+
+ char buffer[MAX_LEN];
+ int num;
+ char num2[MAX_LEN];
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ num = atoi(buffer);
+ sprintf(num2, "%d\n", num);
+
+ printf("%s", num2);
+ return 0;
+}
diff --git a/guia03/ex23.c b/guia03/ex23.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+
+int main ( void ) {
+
+ char buffer[MAX_LEN];
+ int num;
+ char num2[MAX_LEN];
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ num = atoi(buffer);
+
+// Converts num to octal and stores it on num2 str;
+ sprintf(num2, "%o\n", num);
+
+// prints the string with the octal number;
+ printf("%s", num2);
+ return 0;
+}
diff --git a/guia03/ex23_imp.c b/guia03/ex23_imp.c
@@ -0,0 +1,28 @@
+// Reads an integer from stdin and prints it
+// on stdout in octal base;
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+#define ERR_MSG_NEG "Err: the number is negative"
+
+int main ( void ) {
+
+ int num;
+ char buffer[MAX_LEN];
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+// Converts the input str to int, if the number
+// is negative, puts an error message on stderr;
+ if((num = atoi(buffer)) < 0 ) {
+ fprintf(stderr, ERR_MSG_NEG"\n");
+ return 1;
+ }
+
+// prints the integer in octal base;
+ printf("%o\n", num);
+ return 0;
+}
diff --git a/guia03/ex24.c b/guia03/ex24.c
@@ -0,0 +1,27 @@
+// Reads a number from stdin and prints it
+// in hexadecimal base on stout;
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+
+int main ( void ) {
+
+ char buffer[MAX_LEN];
+ int num;
+ char num2[MAX_LEN];
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ num = atoi(buffer);
+
+// Converts num to hexadecimal and stores it
+// on num2 str;
+ sprintf(num2, "%x\n", num);
+
+// prints the string with the octal number;
+ printf("%s", num2);
+ return 0;
+}
diff --git a/guia03/ex24_imp.c b/guia03/ex24_imp.c
@@ -0,0 +1,28 @@
+// Reads an non-negative integer from stdin and prints it
+// on stdout in hexadecimal base;
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+#define ERR_MSG_NEG "Err: the number is negative"
+
+int main ( void ) {
+
+ unsigned int num;
+ char buffer[MAX_LEN];
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+// Converts the input str to int, if the number
+// is negative, puts an error message on stderr;
+ if((num = atoi(buffer)) < 0 ) {
+ fprintf(stderr, ERR_MSG_NEG"\n");
+ return 1;
+ }
+
+// prints the integer in hexadecimal base;
+ printf("%X\n", num);
+ return 0;
+}
diff --git a/guia03/ex25_imp.c b/guia03/ex25_imp.c
@@ -0,0 +1,53 @@
+// Reads an integer from stdin and prints it
+// on stdout in binary base.
+// only for numbers below 128;
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 8
+#define ERR_MSG_NEG "Err: invalid number!"
+
+int main ( void ) {
+
+ int i, num;
+ char buffer[MAX_LEN];
+// 0000 0000
+ int bin[MAX_LEN] = {0,0,0,0,0,0,0,0};
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+// Converts the input str to int, if the number
+// is negative or greater than 128, puts an
+// error message on stderr;
+ if((num = atoi(buffer)) < 0 || num > 128) {
+ fprintf(stderr, ERR_MSG_NEG"\n");
+ return 1;
+ }
+
+// Converts num to binary base by dividing it
+// by 2 until its zero, the rest of the division
+// is stored in every itineration in bin[];
+ for(i = 0; num != 0; i++) {
+ if((num % 2) == 1) {
+ bin[i] = 1;
+ } else {
+ bin[i] = 0;
+ }
+ num = (num / 2);
+ }
+
+// This part print bin in reverse order because
+// the previous algorithm stores the values in
+// reverse order;
+ for(i = 7; i >= 0; i--) {
+ if(i == 3)
+ putchar(' ');
+
+ printf("%d", bin[i]);
+ }
+
+ putchar('\n');
+ return 0;
+}
diff --git a/guia03/ex26.c b/guia03/ex26.c
@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+#define ERR_MAX_STR_LEN "Err: the entered number is too big"
+
+
+int main ( void ) {
+
+ char buffer[MAX_LEN], str1[MAX_LEN], str2[MAX_LEN];
+ char dest[MAX_LEN];
+ int i, j, num;
+
+ if(fgets(str1, MAX_LEN, stdin) == NULL) {
+ return 1;
+ }
+
+// This part counts the length of the first string
+// and replaces the new line character for a blank space;
+ for(i = 0; str1[i] != '\0'; i++)
+ if(str1[i] == '\n')
+ str1[i] = ' ';
+ str1[i + 1] = '\0';
+
+ if(fgets(str2, MAX_LEN, stdin) == NULL) {
+ return 1;
+ }
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL) {
+ return 1;
+ }
+
+ num = atoi(buffer);
+
+// This part checks if the input number is bigger than
+// the length of the first string;
+ if(num > i) {
+ fprintf(stderr, ERR_MAX_STR_LEN"\n");
+ return 1;
+ }
+
+
+// Removes the new line chracter from string two;
+ for(i = 0; str2[i] != '\0'; i++)
+ if(str2[i] == '\n')
+ str2[i] = '\0';
+
+ for(i = 0, j = 0; str2[j] != '\0'; i++) {
+ if((i <= num) && (str1[i] != '\0')) {
+ dest[i] = str1[i];
+ } else {
+ dest[i] = str2[j];
+ j++;
+ }
+ }
+ printf("%s\n", dest);
+ return 0;
+}
diff --git a/guia03/ex27.c b/guia03/ex27.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 100
+
+int main ( void ) {
+
+ char str[MAX_LEN], buffer[MAX_LEN];
+ int i, j, num;
+
+ if(fgets(str, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ if(fgets(buffer, MAX_LEN, stdin) == NULL)
+ return 1;
+
+ num = atoi(buffer);
+
+ for(i = 0; str[i] != '\0'; i++)
+ if(str[i] == '\n')
+ i++;
+ for(j = 0; j <= num; j++)
+ str[i + j] = ' ';
+
+ printf("%s\n", str);
+ return 0;
+}
diff --git a/guia03/ex28.c b/guia03/ex28.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+#define MAX_LEN 20
+
+int main (void) {
+
+ int i, vector[MAX_LEN];
+
+ for(i = 0; i < MAX_LEN; i++)
+ printf("%d\n", vector[i]);
+
+ return 0;
+}
diff --git a/guia03/ex29.c b/guia03/ex29.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 20
+
+int main (void) {
+
+ int i, suma, vector[MAX_LEN], vector_end;
+ char buffer[MAX_LEN];
+
+ vector_end = MAX_LEN;
+ for(i = 0, suma = 0; i < vector_end; i++) {
+ if(fgets(buffer, sizeof(int) + 1, stdin) != NULL) {
+ vector[i] = atoi(buffer);
+ suma += vector[i];
+ } else {
+ vector_end = i;
+ i = MAX_LEN;
+ }
+ }
+ printf("%d\n", suma);
+ return 0;
+}
diff --git a/guia03/ex30.c b/guia03/ex30.c
@@ -0,0 +1,34 @@
+// Calculates the arithmetic mean of a certain amount of
+// numbers. First ask for the quantity and then calculates
+// it and prints it;
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAX_LEN 20
+
+int main (void) {
+
+ int i, n;
+ float x, suma, numbers[MAX_LEN];
+ char buffer[MAX_LEN];
+
+// Read the quantity of numbers to mean;
+ if(fgets(buffer, sizeof(int) + 1, stdin) != NULL)
+ n = atoi(buffer);
+ else return 1;
+
+// Read the values to mean and stores it on numbers;
+ for(i = 0, suma = 0; i < n; i++) {
+ if(fgets(buffer, sizeof(int) + 1, stdin) != NULL) {
+ numbers[i] = atof(buffer);
+ suma += numbers[i];
+ } else return 1;
+ }
+// Calculate the arithmetic mean and stores it on x;
+ x = ((1 / (float)n) * suma);
+
+// Print the arithmetic mean;
+ printf("x = %.3f\n", x);
+ return 0;
+}
diff --git a/guia03/ex30_std_dev.c b/guia03/ex30_std_dev.c
@@ -0,0 +1,45 @@
+// Calculates the arithmetic mean of a certain amount of
+// numbers. First ask for the quantity and then calculates
+// it and prints it;
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#define MAX_LEN 20
+
+int main (void) {
+
+ int i, n;
+ float d, x, suma, numbers[MAX_LEN];
+ char buffer[MAX_LEN];
+
+// Read the quantity of numbers to mean;
+ if(fgets(buffer, sizeof(int) + 1, stdin) != NULL)
+ n = atoi(buffer);
+ else return 1;
+
+// Read the values to mean and stores it on numbers;
+ for(i = 0, suma = 0; i < n; i++) {
+ if(fgets(buffer, sizeof(int) + 1, stdin) != NULL) {
+ numbers[i] = atof(buffer);
+ suma += numbers[i];
+ } else return 1;
+ }
+
+// Calculate the arithmetic mean and stores it on x;
+ x = ((1 / (float)n) * suma);
+
+// Calculates the standard deviation;
+ for(i = 0; i < n; i++) {
+ suma += (numbers[i] - x);
+ d = sqrtf((1/n) * powf(suma, 2.0));
+ }
+
+// Print the arithmetic mean;
+ printf("x = %.3f\n", x);
+
+// Print the standard deviation;
+ printf("d = %.3f\n", d);
+ return 0;
+}
diff --git a/guia03/ex32.c b/guia03/ex32.c
@@ -0,0 +1,65 @@
+// Calculates the max or min in an array of numbers;
+// of type int;
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#define MAX_ELEM 10
+#define NO_ARGUMENT_ENTERED 1
+#define EXTREMO_ARGUMENT 1
+
+typedef enum {
+ MAXIMUM,
+ MINIMUM
+} extreme_t;
+
+typedef enum {
+ OK,
+ ERROR_INVOCATING_PROGRAM,
+ ERROR_NULL_POINTER
+} status_t;
+
+status_t validate_arguments (int argc, char ** argv);
+
+int main (int argc, char * argv[])
+{
+ size_t i;
+ int vector[MAX_ELEM] = {9, 10, 25, 31, 9, 5, 11, 46, 50, 20};
+ extreme_t extremo;
+ status_t st;
+
+ if((st = validate_arguments(argc, argv)) != OK)
+ return st;
+
+ extremo = atoi(argv[EXTREMO_ARGUMENT]);
+ if(extremo == MAXIMUM) {
+ // Find maximum element in array;
+ int maximum;
+ for(i = 0, maximum = INT_MIN; i < (sizeof(vector)/sizeof(vector[0])); i++)
+ if(vector[i] > maximum)
+ maximum = vector[i];
+
+ printf("%d\n", maximum);
+ } else if (extremo == MINIMUM){
+ // Find minimum element in array;
+ int minimum;
+ for(i = 0, minimum = INT_MAX; i < (sizeof(vector)/sizeof(vector[0])); i++)
+ if(vector[i] < minimum)
+ minimum = vector[i];
+
+ printf("%d\n", minimum);
+ }
+ return 0;
+}
+
+status_t validate_arguments (int argc, char ** argv) {
+ if(argc == NO_ARGUMENT_ENTERED)
+ return ERROR_INVOCATING_PROGRAM;
+
+ else if (argv == NULL)
+ return ERROR_NULL_POINTER;
+
+ else return OK;
+}
+
diff --git a/guia03/ex33.c b/guia03/ex33.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define N 10
+
+int main (void)
+{
+ int vector[N];
+ size_t i;
+
+ for(i = 0; i < N; i++) {
+ vector[i] = rand();
+ printf("%d\n", vector[i]);
+ }
+ return 0;
+}
diff --git a/guia03/ex34.c b/guia03/ex34.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+#define N_MAX 10
+
+int main (void)
+{
+ int vector[N];
+
+
+
+
+ return 0;
+}
diff --git a/guia04/ex02.c b/guia04/ex02.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+#define MAX 10
+
+int main ( void ) {
+
+ int x, array[MAX];
+ array[4] = 1;
+
+ x = array[4];
+
+ printf("%d\n", x);
+
+ return 0;
+}
diff --git a/guia05/ex01.c b/guia05/ex01.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+unsigned long fact ( int num ) {
+ unsigned long j, res;
+ res = 1;
+
+ for (j = 1; j <= num; j++) {
+ res = (res * j);
+ }
+ return res;
+}
+
+int main ( void ) {
+
+ printf("%lu\n", fact(5));
+
+ return 0;
+}
diff --git a/guia05/ex02.c b/guia05/ex02.c
diff --git a/guia06/ex01.c b/guia06/ex01.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define ERR_ARG "Error: No arguments"
+
+int main (int argc, char *argv[]) {
+ size_t i;
+ if(argc == 1) {
+ fprintf(stderr, ERR_ARG"\n");
+ return 1;
+ }
+
+ printf("argc: %d \n", argc);
+
+ for (i = 0; i < argc; i++) {
+ printf("argv[%ld] = %s \n", i, argv[i]);
+ }
+
+ return EXIT_SUCCESS;
+}
diff --git a/guia07/ex05.c b/guia07/ex05.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MASK_BYTE 0xFF
+
+int main(void) {
+
+// 0x10 30 25 F4
+ unsigned int n = 271590900;
+
+// Arreglo de 4 bytes;
+ unsigned char v[4];
+
+ size_t i;
+/*
+ v[0] = (n >> 24) & 0xFF;
+ v[1] = (n >> 16) & 0xFF;
+ v[2] = (n >> 8) & 0xFF;
+ v[3] = (n >> 0) & 0xFF;
+*/
+ for(i = 0; i < sizeof(unsigned int); i++)
+ v[i] = (n >> ( (sizeof(unsigned int) - 1 - i) * 8 )) & 0xFF;
+
+ printf("%d\n", n);
+ printf("%x\n", n);
+
+ for(i = 0; i < sizeof(unsigned int); i++)
+ printf("v[%lu] = %x\n", i, v[i]);
+
+ return EXIT_SUCCESS;
+}
diff --git a/guia08/ex01.c b/guia08/ex01.c
@@ -0,0 +1,58 @@
+// Clones a given string entered as arguments of function main;
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define NO_ARGUMENT 1
+#define INIT_SIZE 100
+
+typedef enum {
+ OK,
+ ERROR_PROGRAM_INVOCATION,
+ ERROR_NULL_POINTER,
+ ERROR_ALLOC_MEMORY
+} status_t;
+
+status_t validar_argumentos(int argc, char **argv);
+
+int main (int argc, char * argv[])
+{
+ char *dest;
+ size_t i;
+ status_t st;
+
+// Verify if arguments are right;
+ if((st = validar_argumentos(argc, argv) != OK))
+ return st;
+
+// Allocates memmory in heap of size INIT_SIZE;
+ if((dest = (char *)malloc(INIT_SIZE * sizeof(char))) == NULL)
+ return ERROR_ALLOC_MEMORY;
+
+// Assigns 1 to i to avoid the first element of argv,
+// which is the program name. Then copies every string of argv
+// into dest and prints it on stdout;
+ for(i = 1; (int)i < argc; i++) {
+ strcpy(dest, argv[i]);
+ // Puts a space in between strings, avoiding a blank
+ // space after first string is printed;
+ if(i != 1) putchar(' ');
+ printf("%s", dest);
+ }
+
+// Adds the new line character;
+ putchar('\n');
+ free(dest);
+ return OK;
+}
+
+status_t validar_argumentos(int argc, char **argv)
+{
+ if(argc == NO_ARGUMENT)
+ return ERROR_PROGRAM_INVOCATION;
+
+ else if(argv == NULL)
+ return ERROR_NULL_POINTER;
+
+ else return OK;
+}
diff --git a/guia08/malloc_basics.c b/guia08/malloc_basics.c
@@ -0,0 +1,22 @@
+// Stores an array of numbers in heap, then prints it on
+// stdout finally frees the memory used;
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define ARR_LEN 10
+
+int main (void)
+{
+ int *p;
+
+ if((p = (int*)malloc(ARR_LEN * sizeof(int))) == NULL)
+ return 1;
+
+ for(int i = 0; i < ARR_LEN; i++) {
+ *(p + i) = i;
+ printf("%d\n", *(p + i));
+ }
+ free(p);
+ return 0;
+}
diff --git a/guia08/text.txt b/guia08/text.txt
@@ -0,0 +1,23 @@
+The malloc() function allocates size bytes and returns a pointer
+to the allocated memory. The memory is not initialized. If size
+is 0, then malloc() returns either NULL, or a unique pointer value
+that can later be successfully passed to free().
+
+The free() function frees the memory space pointed to by ptr,
+which must have been returned by a previous call to malloc(), cal‐
+loc(), or realloc(). Otherwise, or if free(ptr) has already been
+called before, undefined behavior occurs. If ptr is NULL, no op‐
+eration is performed.
+
+The calloc() function allocates memory for an array of nmemb ele‐
+ments of size bytes each and returns a pointer to the allocated
+memory. The memory is set to zero. If nmemb or size is 0, then
+calloc() returns either NULL, or a unique pointer value that can
+later be successfully passed to free(). If the multiplication of
+nmemb and size would result in integer overflow, then calloc() re‐
+turns an error. By contrast, an integer overflow would not be de‐
+tected in the following call to malloc(), with the result that an
+incorrectly sized block of memory would be allocated:
+
+ malloc(nmemb * size);
+
