C#

static void Main(string[] args)
{
    Console.Write("Enter any integer: ");
    int inputValue;
    int.TryParse(Console.ReadLine(), out inputValue);
    if (isPrimeNumber(inputValue))
    {
        Console.WriteLine(inputValue + " is a prime number.");
    }
    else
    {
        Console.WriteLine(inputValue + " is not a prime number.");
    }
    Console.Write("Any key to exit... ");
    Console.ReadKey();
}

public static bool isPrimeNumber(int num)
{
    if (num < 2)
    {
        return false;
    }
    for (int i = 2; i < num; i++)
    {
        if (num % i == 0)
        {
            return false;
        }
    }
    return true;
}

DaveyM69 wrote:

Paul... I'm not doing his homework

if (num==2) return true;
for (int i = 3; i*i <= num; i+=2)

class Prime
{

    public static bool isPrime(double numIn)
    {

        double testNum;
        double testLimit;

        testLimit = numIn;
        testNum = 3;

        if (0 == testLimit % 2)
        {
            return false;
        }

        while (testLimit > testNum)
        {

            if (0 == numIn % testNum)
            {
                return false;
            }

            testLimit = numIn / testNum;
            testNum += 2;

        }//while (testLimit > testNum)

        return true;

    }//isPrime

}//Prime

Luc Pattyn wrote:

why would you use doubles both in the API and inside the method, when the problem at hand
is basically an integer one?

DaveyM69 wrote:

What use it would be I don't know as it will never run without the Operating System plus .net framework. You would need to develop a hardware driver as well to communicate between your eeprom/microcontroller and the operating system/framework.

DaveyM69 wrote:

If you want it as a standalone thing without a computer connected then no as the operating system and .net framework need a PC to run plus attempting to copy them would be highly illegal.

kriskris wrote:

i'm lost ...

kriskris wrote:

the next situation