/*a perfect number is a positive integer that is equal to the sum of
its proper positive divisors, that is, the sum of its positive divisors
excluding the number itself.
Read here: en.wikipedia.org/wiki/Perfect_number
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication2
{
class Program
{
static void PerfectNumber(int a)
{
int sum = 0;
for (int idx = 1; idx < a; idx++)
{
int id = a % idx;
if (id == 0)
{
sum = sum + idx;
}
}
Console.WriteLine();
Console.WriteLine("The sum of all it's proper divisors is: "+sum+'\n');
if (sum == a)
{
Console.WriteLine("YES! "+a+ " is a Perfect number");
}
else
Console.WriteLine("No! " + a + " is NOT a Perfect number");
}
static void Main(string[] args)
{
Console.WriteLine("********************************************************");
Console.WriteLine("To Check the whether entered number is Perfect Number !");
Console.WriteLine();
Console.Write("Enter the a desired Number:");
int abc = int.Parse(Console.ReadLine());
PerfectNumber(abc);
}
}
}
