57: Write a program in C++ to check if the user entered a perfect number or not using for, while and do while loop

 

// Write a program in C++ to check if the user entered a perfect number or not

#include <iostream>

using namespace std;

int main()

{

    int num;

    cout << "\nEnter a number: ";

    cin >> num;

    cout << "\n**************************************************************\n\n";

    int a = 0;

    cout << "Factors of " << num << " are: ";

    for (int i = 1; i < num; i++)

    {

        if (num % i == 0)

        {

            cout << i << ' ';

            a = a + i;

        }

    }

    if (a == num)

    {

        cout << "\nThe number " << num << " is a Perfect number \n";

    }

    else

    {

        cout << "\nThe number " << num << " is not a Perfect number \n";

    }

    cout << "\n**************************************************************\n\n";

    int j = 1, b = 0;

    cout << "The factors of " << num << " are: ";

    while (j < num)

    {

        if (num % j == 0)

        {

            cout << j << ' ';

            b = b + j;

        }

        j++;

    }

    if (b == num)

    {

        cout << "\nThe number " << num << " is a perfect number \n";

    }

    else

        cout << "\nThe number " << num << " is not a perfect number \n";

    cout << "\n**************************************************************\n\n";

    int k = 1, c = 0;

    cout << "The factors of " << num << " are: ";

    do

    {

        if (num % k == 0)

        {

            cout << k << " ";

            c = c + k;

        }

        k++;

    } while (k < num);

    if (c == num)

    {

        cout << "\nThe number " << num << " is a perfect number \n";

    }

    else

        cout << "\nThe number " << num << " is not a perfect number \n";

    cout << "\n**************************************************************\n\n";

   

    return 0;

}