01.Homework-SomePrimes

// Find the 24th, 101st and 251st prime number.
using System;

class PrimeNumbers
{
    static void Main()
    {
        Console.WindowWidth = 80;

        int prime24 = 0;
        int prime101 = 0;
        int prime251 = 0;
        int counting = 1;
        bool isPrime = true;

        Console.Write("Enter a Number: ");
        int number = int.Parse(Console.ReadLine());

        Console.WriteLine("\n" + "Prime Numbers: " + "\n" + new string('-', 80));

        for (int i = 2; i <= number; i++)
        {
            for (int a = 2; a < i; a++)
            {
                if (i != a && i % a == 0)
                {
                    isPrime = false;
                    break;
                }
            }
            if (isPrime)
            {
                Console.Write("No" + counting++ + " is " + i + "\t");
            }
        isPrime = true;
        if (counting == 24)
            prime24 = i + 1;
        if (counting == 101)
            prime101 = i + 1;
        if (counting == 251)
            prime251 = i + 1;
        if (counting == 252)
            break;
        }
        Console.WriteLine("\n" + new string('-', 80));
        Console.WriteLine("No24 of Prime is " + prime24);
        Console.WriteLine("No101 of Prime is " + prime101);
        Console.WriteLine("No251 of Prime is " + prime251);

        Console.ReadLine();
    }
}