4Francesca

prime.cs

using System;

public class Test
{
	
	private static bool IsPrime(int num)
	{
		if (num == 0 || num == 1) return false;
		if (num == 2) return true;
		for (int i = 2; i < num; ++i) {
			if (num % i == 0) return false;
		}
		return true;
	}
	
	public static void Main()
	{
		for (int i = 1; i <= 10; ++i)
		{
			Console.WriteLine("{0}: {1}", i, IsPrime(i));
		}
	}
}