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

Mukul Goenka 706 14 Nov 2021

Mukul Goenka

Student

An MBA in finance imparts and improves management aptitude, inventive ability, critical thinking ability, and so forth. It offers a real-time experience that fabricates a staunch career foundation for students and working professionals. It helps them to thoroughly understand the financial sector.

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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