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C# C# Basics (Retired) Perfect Final

Josh Boersma
Josh Boersma
Courses Plus Student 2,486 Points

Catching Exception Refuses to Compile

Challenge: Add input validation to your program by printing “You must enter a whole number.” if the user enters a decimal or something that isn’t a number. Hint: Catch the FormatException.

I'm at work at and can't look at compile errors. So I have no clue why this isn't working (I'm a CS major and should be doing this easy). Any pointers or directional help would be fantastic.

using System;

namespace Treehouse.CodeChallenges {
    class Program {
        static void Main() {
           int count = 0;
            while (true) {
               try { 
                    Console.WriteLine("Enter the number of times to print \"Yay!\": ");
                    count = Console.ReadLine();
                    //int count = Convert.ToInt32(c);
                    if(count <= 0) {
                        Console.WriteLine("You must enter a whole number.");
                   if (count == null){
                        Console.WriteLine("You must enter a whole number.");

                    int total = 0;
                    while (total < count) {
                        total = total + 1;
                }   //try
                catch(FormatException) {
                    Console.WriteLine("You must enter a whole number.");
        }  //Main

1 Answer

Steven Parker
Steven Parker
229,018 Points

You have an outer loop that prevents the program from ending if bad values are entered.

A program built according to the instructions will prompt and accept input one time, and based on the input it will either print "Yay!"s or an error mesage. Either way, it should end. With the extra loop it never ends.