Input Validation

Question

Can someone help me out with my code. Its asking for input validation for a negative number input.

Program.cs

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
            try
            {
                Console.Write("Enter the number of times to print \"Yay!\": ");
                string input = Console.ReadLine();
                int input2 = int.Parse(input);

                while (input2 > 0)
                {
                    if (input2 != 0)
                    {
                        input2 -= 1;
                        Console.WriteLine("Yay!");
                    }
                    else
                    {
                        break;
                    }
                }
            }
            catch (FormatException)
            {
                Console.WriteLine("you must enter a whole number");
            }
            catch
            {
                Console.WriteLine("you must enter a positive number");
            }
        }
    }
}

Answer 1 · 2017-03-30T15:44:38Z

March 30, 2017 3:44pm

You don't need a catch to check for a negative input.

You can do this easily after you have parsed the input into a number. Then you can test the number in an if statement to see if it is negative, and if so give the feedback and end the program.

Also, you don't need that if inside the while, because the loop condition itself is enough to cause the loop to stop.

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Patrick Parreno

Patrick Parreno

Input Validation

1 Answer

Steven Parker

Steven Parker

You don't need a catch to check for a negative input.