03.OperatorsExpressionsStatements/08.PrimeNumberCheck

//Problem 8.    Prime Number Check
//Write an expression that checks if given positive integer number n (n ≤ 100) is prime (i.e. it is divisible without remainder only to itself and 1). Examples:

using System;

class PrimeNumberCheck
{
    static void Main()
    {
        Console.Write("Please, enter a positive integer number n (n <= 100):");
        int number = int.Parse(Console.ReadLine());
        if (number >= 0 && number <= 100)
        {
            int counter = 0;
            for (int i = 1; i <= number; i++)
            {
                if (number%i==0)
                {
                    counter++;
                }
            }
            bool checkNumber=(counter==2);
            if (checkNumber)
            {
                Console.WriteLine("{0}.The number {1} is prime.",checkNumber,number);
            }
            else
            {
                Console.WriteLine("{0}.The number {1} is NOT prime.", checkNumber, number);
            }

        }
        else
        {
            Console.WriteLine("Wrong number! Please, enter a positive integer number n (n <= 100):");
        }
    }
}