C STRING (Comparison)

#include "stdafx.h"
#include <iostream>
#include <cstring>

using namespace std;

int strcmp(char str[], char str2[])
{
		if (str < str2)
		
			return -1;
		/*{
			cout << "l e s s e r" << endl;
		}*/
		else if (str > str2)
		
			return 1;
		/*{
			cout << "g r e a t e r" << endl;
		}*/
		else if (str == str2)
		
			return 0;
		/*{
			cout << "e q u a l i t y" << endl;
		}*/
                      // what should i write here.. ?? this is causing a warning message from compiler.

}

int main()
{ 
	const int length = 15;
	char red[length], black[length]; // two strings that can hold 15 characters including null character.
	cout << "Enter First STRING: ";
	cin.getline(red, length+1); //  user allowed to enter a string of 15 characters + 1 for null character. 
	cout << "Enter Second STRING: ";
	cin.getline(black, length+1);
	strcmp(red, black);
	system("Pause");
	return 0;

}