Write a program in C to compare two strings without using string library functions.
#include <stdio.h>
#define str_size 100
int test(char* s1, char* s2)
{
int flag = 0;
while (*s1 != '\0' || *s2 != '\0') {
if (*s1 == *s2) {
s1++;
s2++;
}
else if ((*s1 == '\0' && *s2 != '\0')||(*s1 != '\0' && *s2 == '\0')||*s1 != *s2) {flag=1;
break;
}
}
return flag;
}
int main(void)
{
char str1[str_size], str2[str_size];
int flg=0;
printf("\nInput the 1st string : ");
fgets(str1, sizeof str1, stdin);
printf("Input the 2nd string : ");
fgets(str2, sizeof str2, stdin);
printf("\nString1: %s", str1);
printf("String2: %s", str2);
flg = test(str1, str2);
if(flg == 0)
{
printf("\nStrings are equal.\n");
}
else if(flg == 1)
{
printf("\nStrings are not equal.");
}
return 0;
}Output
Input the 1st string : Hello
Input the 2nd string : World
String1: Hello
String2: World
Strings are not equal.
Input the 1st string : Hello
Input the 2nd string : Hello
String1: Hello
String2: Hello
Strings are equal.