#include<iostream>
using std::cin;
using std::cout;
using std::endl;
 
int perfect (int);
 
int main ()
{
int number = 1;
int p = 0; //instead of perfect
//etc....

#include <iostream>
using std::cin;
using std::cout;
using std::endl;
 
int perfect_function (int);
 
int main ()
{
    int number = 1;
    int perfect = 0;
 
    for(number=1; number < 1000; number++)
    {
        perfect = perfect_function(number);  //here is where I call the function
        if (perfect > 0)
        {
            cout << perfect << " is a perfect number." << endl;
            cout << "It's factors are: ";
 
            for ( int y = 1; y < perfect/2; y++ )
            {
                int divisor = perfect / y;
 
                if ( perfect % y == 0 && y <= divisor)
                {    
                    cout << divisor << " " << y << endl;
                }
            } // ends factor perfect
        } // ends if perfect
    } // ends for to 1000
    return 0;
}// ends main
 
int perfect_function (int counter)  //here is where the function starts
{
    int sum = 0;
    int divisor = 0;
    int y = 0;
    for (y = 1; y < counter/2; y++)
    {
        divisor = counter / y;
        if ( counter % y == 0 && y <= divisor)
        {
            int factors = y + divisor;
            sum += factors;
        }
    }
    if (sum - counter == counter)
    {
        return counter;
    }
    else
        return 0;
}//ends function

int main()
...
return 0; // to the OS