This C program is used to compare two strings without using strcmp function.

Program:

#include<stdio.h>#include<string.h>int cmpstr(char s1[10], char s2[10]);  int main() {    char arr1[10] = "Nodalo";    char arr2[10] = "nodalo";    printf(" %d", cmpstr(arr1, arr2));    //cmpstr() is equivalent of strcmp()    return 0;    }/    /s1, s2 are strings to be compared    int cmpstr(char s1[10], char s2[10]) {    //strlen function returns the length of argument string passed    int i = strlen(s1);    int k = strlen(s2);    int bigger;    if (i < k) {      bigger = k;    }    else if (i > k) {      bigger = i;    }    else {      bigger = i;    }    //loops 'bigger' times    for (i = 0; i < bigger; i++) {      //if ascii values of characters s1[i], s2[i] are equal do nothing      if (s1[i] == s2[i]) {      }      //else return the ascii difference      else {        return (s1[i] - s2[i]);      }    }    //return 0 when both strings are same    //This statement is executed only when both strings are equal    return (0);  }

Program Output:

-32

Explanation:

cmpstr() is a function that illustrates C standard functionstrcmp(). Strings to be compared are sent as arguments tocmpstr().

Each character in string1 is compared to its corresponding character in string2. Once the loop encounters a differing character in the strings, it would return the ASCII difference of the different characters and exit.