C Program to Find the Length of a String

  Calculate Length of String without Using strlen() Function

#include <stdio.h>
int main()
{
    char s[1000], i;
    printf("Enter a string: ");
    scanf("%s", s);
    for(i = 0; s[i] != '\0'; ++i);
    printf("Length of string: %d", i);
    return 0;
}

Output:-