commit 1740cfdb3f8fbfbf2ea9392142aa4925e0ed2769
parent f998270e72e814bd147bc23613441adfda654f54
Author: Martin J. Klöckner <martin.cachari@gmail.com>
Date: Thu, 26 Nov 2020 01:19:10 -0300
Added ex24.c, ex24_imp.c & ex25_imp.c "Improved versions";
Diffstat:
3 files changed, 108 insertions(+), 0 deletions(-)
diff --git a/95.11/guia03/ex24.c b/95.11/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/95.11/guia03/ex24_imp.c b/95.11/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/95.11/guia03/ex25_imp.c b/95.11/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, r, num, aux;
+ 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((r = (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;
+}
