perfect.cpp

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/*
   This program prints out the perfect numbers between 1 and N
*/
 
#include <iostream>
using namespace std;
 
bool isPerfect(int j){
    int sum_factor = 0;
    for (int factor = 1; factor<j; factor++){
        if (j % factor == 0) {
            sum_factor += factor;
        }
    }
    return j == sum_factor;
}
 
const int N = 1000;
 
int main()
{
    cout << "For the integers from 1 to " << N << ":\n";
 
    for (int j = 2; j <= N; ++j)
        if (isPerfect(j))
            cout << j << " is perfect\n";
 
    cout << endl;
 
    return 0;
}