/*
Ohad Elias
ID 307880880
Computer science Introduction
exerscise 5 question 2
this program prints the perfect numbers
up to the user input
and than prints the perfect numbers until 500
*/
#include <iostream>
using namespace std;
int perfect(int num)
{
	int sum = 0;
	for (int i = 2; i < num; i++)
	{
		if (num % i == 0) // so i divides num
			sum = sum + i;  // we want to sum all the numbers that divides num
	}
	sum = sum++; // for num itself
	bool equal; 
	sum == num;
	if (sum == num)
		equal = true;
	else
		equal = false;
	return equal;
}
void printPerfects(int num=500) // 500 if the output is empty
{
	for (int n = 2; n < num; n++)
	{
		if (perfect(n) == true)
			cout << n << " ";
	}
	cout << endl; // we want an empty line, even if the program didnt print anything at all
	return;
}
int main()
{
	cout << "enter a number:\n";
	int num;
	cin >> num;
	
	while (num < 1) // num should be positive
	{
		cout << "ERROR" << endl;
		cin >> num;
	}
	
		printPerfects(num);
		printPerfects();
	
	return 0;
}
/*
enter a number:
8200
6 28 496 8128
6 28 496
C:\Users\elias\Documents\ìéîåãéí\ùðä à\îáåà ìîãòé äîçùá\ùéòåøé áéú\úøâéì áéú 5\question 2\Debug\question 2.exe (process 26272) exited with code 0.
Press any key to close this window . . .
*/