How do I make a C# program that checks for given array by user which elements are perfect numbers?

Mukul Goenka 895 14 Nov 2021

Ask by Mukul Goenka

Updated 14 Nov 2021

1 Answers

Ravi Vishwakarma 15 Nov 2021

using System;
class HelloWorld {
    static void Main() {
        int[] myNum = {10, 6, 20, 28, 30, 40, 496, 500};
        HelloWorld hw = new HelloWorld();
        hw.printPrimeNumber(myNum);
    }
    public void printPrimeNumber(int[] array){
        for(int i=0; i<array.Length; i++)
            if(checkPerfectNo(array[i]))
                Console.WriteLine(array[i] + ' is prime number');
            else
                Console.WriteLine(array[i] + ' is not prime number');
    }
    public bool checkPerfectNo(int num){
    int sum = 0;
    for(int i= 1; i<=num/2; i++)
        if(num % i == 0)
            sum+=i;
    return num == sum ;
    }
}

Output.

10 is not prime number

6 is prime number

20 is not prime number

28 is prime number

30 is not prime number

40 is not prime number

496 is prime number

500 is not prime number

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How do I make a C# program that checks for given array by user which elements are perfect numbers?

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