Prime Number Checker Using Classes in C++

A simple program that I wrote a long time ago while learning C++ object oriented programming I called this program prime number checker using classes in C++ that will ask the user to enter a number and then our program will check if the number given is prime number or not a prime number.

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Thank you very much and Happy Programming.

Sample Program Outputn

Program Listing

#include <iostream>

using namespace std;

class prime {

  public:

   int n;

   int smalldiv (int n) {

  int count;

  count = 2;

  while (count < n && n % count != 0) {

    count = count + 1;

  }

  return(count);

}

};

 main () {

  prime value;

  cout << "\t Prime Number Checker 1.0";

  cout << "\n\n";

    while (1) {

        cout << "\n";

        cout << "Enter a number: ";

        cin >> value.n;

        if (value.n == 0) {

            cout << "\n\n";

            cout << "Thank you for using this Program.";

            break;

        }

        cout << "\n";

            if (value.n == value.smalldiv(value.n)) {

                cout  << value.n << " is a prime number" << endl;

            }

    else {

        cout << value.n << " is not a prime number" << endl;

        }

     }

  cout << "\n\n";

  system("pause");

 }