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Home Forums Write a program to check if a given number is a perfect number or not. – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 15 Jun 2023
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Sure, here is the C# code to check if a given number is a perfect number or not:

C#

using System;

class PerfectNumber
{
    static void Main(string[] args)
    {
        int number = Convert.ToInt32(Console.ReadLine());
        int sum = 1;

        for (int i = 2; i * i <= number; i++)
        {
            if (number % i == 0)
            {
                if (i * i != number)
                {
                    sum += i + number / i;
                }
                else
                {
                    sum += i;
                }
            }
        }

        if (sum == number)
        {
            Console.WriteLine("{0} is a perfect number.", number);
        }
        else
        {
            Console.WriteLine("{0} is not a perfect number.", number);
        }
    }
}

This program first reads a number from the user. Then, it uses a for loop to iterate through all the positive divisors of the number. For each divisor, it adds the divisor to a variable called sum. Finally, it checks if the value of sum is equal to the original number. If it is, then the number is a perfect number. Otherwise, the number is not a perfect number.

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