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C# C# Basics (Retired) Perfect Wrap Up

Posted by Viktor Johansson
Viktor Johansson
3,523 Points

Breaking out of two loops

Everything is finished but I have to add code for the user to be able to quit from any of the inputs. However, I can't break out of the loop as it would just break the innermost loop and continue looping inputs from the outer loop. Possibly I could make a function for this and use a return statement, but as it hasn't been introduced in the course yet, I'm trying to avoid it to figure out another solution. Here's my code:

using System;

namespace Arithmetic
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            var number1 = 0.0;
            var number2 = 0.0;
            var result = 0.0;
            var operation = "";

            // keep everything running until user inputs quit
            while (true) {
                // Keep prompting until user inputs a valid number
                while (true) {
                    Console.Write ("Please enter your first number or \"quit\": ");
                    var str = Console.ReadLine ();

                    if (str == "quit")
                        // do something

                    try {
                        number1 = double.Parse (str);
                        break;
                    } catch (FormatException) {
                        Console.WriteLine ("Invalid number try again!");
                        continue;
                    }
                }

                // Keep prompting until user inputs a valid operation
                while (true) {
                    Console.Write ("What arithmetic operation would you like to do? +-/*^   : ");
                    operation = Console.ReadLine ();

                    if ((operation == "+") || (operation == "-") || (operation == "^") ||
                        (operation == "/") || (operation == "*")) {
                        break;
                    } else if (operation == "quit")
                        // do something
                    else
                        continue;
                }

                // Keep prompting until user inputs a valid number
                while (true) {
                    Console.Write ("Please enter your second number: ");
                    var str = Console.ReadLine();

                    if (str == "quit")
                        // do something

                    try {
                        number2 = double.Parse (str);
                        break;
                    } catch (FormatException) {
                        Console.WriteLine ("Invalid number try again!");
                        continue;
                    }
                }

                // do arithmetic calculations
                if (operation == "+")
                    result = number1 + number2;
                else if (operation == "-")
                    result = number1 - number2;
                else if (operation == "/")
                    result = number1 / number2;
                else if (operation == "*")
                    result = number1 * number2;
                else if (operation == "^")
                    result = Math.Pow (number1, number2);

                Console.WriteLine ("Your result is: " + result);
            }
        }
    }
}

1 Answer

Viktor Johansson
Viktor Johansson
3,523 Points
Viktor Johansson
Viktor Johansson
3,523 Points

I decided to go with System.Environment.Exit.. Does anyone know if that is good or bad practise ?

lonedo
lonedo
24,500 Points 
//Prompt the user for a number.
     Console.WriteLine("Enter a Number or type \"quit\" to stop: ");
     var input = Console.ReadLine();
//Repeat until the user types in “quit” at any of the prompts.
      if (input.ToLower() == "quit")
      {
            break;
      }