commit 5b0c7727acfbfbabaa92c98e9fcbfd05bdb53ab2
parent 2592dacde0f85370b96465084e873e3f2c3fdeda
Author: klewer-martin <martin.cachari@gmail.com>
Date: Mon, 31 May 2021 12:50:17 -0300
Updated guia03 exercises
Diffstat:
9 files changed, 46 insertions(+), 56 deletions(-)
diff --git a/guia03/ex01.c b/guia03/ex01.c
@@ -12,7 +12,7 @@ int main(void) {
puts(s);
printf("> ");
- // gets(s); removed from std C11 because it's very unsecure
+ /* gets(s); removed from std C11 because it's very unsecure */
fgets(s, MAX_LEN, stdin);
puts(s);
diff --git a/guia03/ex02.c b/guia03/ex02.c
@@ -7,13 +7,15 @@
int main(void) {
char s[MAX_LEN];
- if(fgets(s, MAX_LEN, stdin) == NULL) {
+
+ if(!fgets(s, MAX_LEN, stdin)) {
fprintf(stderr, ERR_EMPTY_MSG"\n");
return 1;
- } else if(strcmp(s, "") == 0) {
+ } else if(!strcmp(s, "")) {
fprintf(stderr, ERR_EMPTY_MSG"\n");
return 1;
}
+
printf("%s", s);
return 0;
}
diff --git a/guia03/ex04.c b/guia03/ex04.c
@@ -4,11 +4,10 @@
int main(void) {
char s[] = "Hello world!\n";
- char aux;
- int n;
+ int i, aux;
- for(n = strlen(s); n >= 0; n--) {
- aux = s[n];
+ for(i = strlen(s); i >= 0; i--) {
+ aux = s[i];
if(aux != '\n')
putchar(aux);
}
diff --git a/guia03/ex05.c b/guia03/ex05.c
@@ -6,8 +6,10 @@ int main(void) {
char s[] = "Hello world!\n";
int i;
- for(i = 0; s[i] != '\0'; i++) {
- }
+
+ for(i = 0; s[i]; i++)
+ ;
+
printf("%d\n", i);
return 0;
diff --git a/guia03/ex06.c b/guia03/ex06.c
@@ -7,18 +7,15 @@ int main(void) {
char origen[] = "Hello world!\n";
size_t i, len;
+
len = strlen(origen);
- char destino[len];
+ char destino[len]; /* +1 for the '\0' */
- for(i = 0; i <= len; i++) {
+ 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
@@ -2,13 +2,13 @@
#include <string.h>
-int main(void) {
+int main(void)
+{
+ int i, s1_len, s2_len, cat_len;
char s1[] = "Hello world!";
char s2[] = "Hola mundo!";
-
- int i, s1_len, s2_len, cat_len;
s1_len = strlen(s1);
s2_len = strlen(s2);
diff --git a/guia03/ex08.c b/guia03/ex08.c
@@ -5,8 +5,8 @@ size_t str_len(const char *str) {
if(str == NULL)
return 1;
- size_t i;
- for(i = 0; str[i] != '\0'; i++)
+ size_t i = 0;
+ while(str[i++])
;
return i;
@@ -33,6 +33,7 @@ int main(void) {
cmp += (s1[i] - s2[i]);
}
}
+
printf("%d\n", cmp);
return 0;
}
diff --git a/guia03/ex08_modular.c b/guia03/ex08_modular.c
@@ -9,8 +9,9 @@ size_t str_len(const char *str)
{
if(str == NULL)
return 1;
+
size_t i;
- for(i = 0; str[i] != '\0'; i++)
+ while(str[i++])
;
return i;
@@ -20,7 +21,7 @@ size_t str_len(const char *str)
<string.h> library */
int str_cmp(const char *str1, const char *str2)
{
-// In case one of the given strings is NULL returns 1;
+ /* In case one of the given strings is NULL returns 1; */
if(str1 == NULL || str2 == NULL)
return 1;
@@ -30,17 +31,17 @@ int str_cmp(const char *str1, const char *str2)
str1_len = str_len(str1);
str2_len = str_len(str2);
-// Assigns the length of the longer string to j;
+ /* 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
+ /* 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
+ /* 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) {
diff --git a/guia03/ex09_modular.c b/guia03/ex09_modular.c
@@ -3,58 +3,46 @@
/* similar to strncmp() function from <string.h> */
#include <stdio.h>
+#include <string.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++)
- ;
+
+ if(!str) return 1;
+
+ for(i = 0; str[i]; 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)
+int str_cmp(const char *sa, const char *sb, size_t n)
{
- if(str1 == NULL || str2 == NULL)
- return 1;
+ /* Since the return value is an integer this function won't check for errors */
+ int cmp;
+ size_t i;
+
+ for(i = cmp = 0; (i < n) && sa[i] && sb[i]; i++)
+ cmp += sa[i] - sb[i];
- 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";
+ char s1[] = "HELLO";
+ char s2[] = "hello";
- int i;
- i = str_cmp(s1, s2, 4);
+ int i, j;
+ i = str_cmp(s1, s2, 109);
+ j = strncmp(s1, s2, 8);
- printf("%d\n", i);
+ printf("%d\n%d\n", i, j);
return 0;
}
