C++ Compare strings

Read two strings and compare them.

#include <stdio.h>

#define LenLine 81

// read two strings and compare them

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


void main()
{
  char  str1[LenLine] , str2[LenLine];
  int   result ;

  printf(" insert first string(80 char max):  ");
  gets(str1) ;

  printf("\n insert second string(80 char max):  ");
  gets(str2) ;
 
  result = compStr(str1,str2);
  if (!result) 
	printf("\n The two string are equal \n");
  else
	printf("\n The two string are diffrent. the diffrent between the two
                       first char is: %d \n\n",result);
}



int compStr(char str1[],char str2[])
{
	int i;

	for (i=0 ; str1[i]==str2[i] ; i++)
	   if (!str1[i]) return 0;
	return str1[i]-str2[i];
}