61: Write a program in C++ to check whether a number is prime or not using for, while.


// Write a program in C++ to check whether a number is prime or not using for, while, do while loop.
//     Sample Output:
//     Input a number to check prime or not: 13
//     The entered number is a prime number.
//     **************************************************************************************************

#include <iostream>
using namespace std;
int main()
{
    int num;
    cout << "\nInput a number to check prime or not: ";
    cin >> num;

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

    int a = 0;
    for (int i = 1; i <= num; i++)
    {
        if (num % i == 0)
        {
            a++;
        }
    }
    if (a == 2)
    {
        cout << "The Entered number is a Prime number \n";
    }
    else
        cout << "The Entered number is not a Prime number\n";
    cout << "\n***********************************************************\n\n";

    int b = 0, j = 1;
    while (j <= num)
    {
        if (num % j == 0)
        {
            b++;
        }
        j++;
    }
    if (b == 2)
    {
        cout << "The Entered number is a Prime number\n";
    }
    else
        cout << "The Entered number is not a Prime number\n";
    cout << "\n***********************************************************\n\n";

    return 0;
}



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