task20

using System;

public class Program
{
    public static void Main()
    {
        int inputNumber;
        inputNumber = InputNumber();
        Console.WriteLine($"Number is : {inputNumber}");
    }

    public static int InputNumber()
    {
        int inputNumber = 0;
        bool isInput = true;
        while (isInput)
        {
            Console.WriteLine("Input a number : ");
            if (int.TryParse(Console.ReadLine(), out inputNumber) == true)
                isInput = false;
            else
                Console.WriteLine("Cannot parse a input number");
        }
        return inputNumber;
    }
}