// Programmer: Anna Liu

// Date: Start Nov. 7  End: Nov. 8

// Project: Prime Number Tester

// Description: Finds if the input number is a Prime number or not

​

using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("{0,30}","Prime Number Tester"); //Title

        Console.WriteLine(new String ('=',40));

        run: //Allows the code to be repeated again

        Console.Write("Enter a Number: ");

        int num = Convert.ToInt32(Console.ReadLine());

        int divide = 0; //Variable will count how many times we can divide num by a whole number 

        for (int x = 1; x<=num; x++) { //check if x is less than equal to the num if true increment by 1

        if (num % x ==0) //% means divide the num and returns the remainder for example 7 divided or % by 2. 1 is the remainder 

        { //The num entered will be divided by x and the remainder is 0 

            divide++; //Update the amount of dividors that the inputed numuber has   

        }

        }

        if (divide ==2) // If the divisor is two than the number is a prime number

            Console.WriteLine(num +" is PRIME number!");

        else 

            Console.WriteLine(num +" is a COMPOSITE number!"); //The number is not a prime number

        Console.WriteLine(" ");

        goto run;

    }

}