Compare Two Strings using Pointers

/*

Write a program to compare two string using pointers

*/

#include<stdio.h>

int compare_string(char*, char*);

main()
{
char first[100], second[100], result;

printf("Enter first string\n");
gets(first);

printf("Enter second string\n");
gets(second);

result = compare_string(first, second);

if ( result == 0 )
printf("Both strings are same.\n");
else
printf("Entered strings are not equal.\n");

return 0;
}

int compare_string(char *first, char *second)
{
while(*first==*second)
{
if ( *first == '\0' || *second == '\0' )
break;

first++;
second++;
}
if( *first == '\0' && *second == '\0' )
return 0;
else
return -1;
}