C program to compare two strings without using string functions

#include<stdio.h>

int stringCompare(char[],char[]);

int main(){

    char str1[100],str2[100];

    int compare;

    printf("Enter first string: ");

    scanf("%s",str1);

    printf("Enter second string: ");

    scanf("%s",str2);

    compare = stringCompare(str1,str2);

    if(compare == 1)

         printf("Both strings are equal.");

    else

         printf("Both strings are not equal");

 

    return 0;

}

int stringCompare(char str1[],char str2[]){

    int i=0,flag=0;

   

    while(str1[i]!='\0' && str2[i]!='\0'){

         if(str1[i]!=str2[i]){

             flag=1;

             break;

         }

         i++;

    }

    if (flag==0 && str1[i]=='\0' && str2[i]=='\0')

         return 1;

    else

         return 0;

}