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C# C# Objects Encapsulation and Arrays Ternary If

Posted by elomaur
elomaur
5,276 Points

Compiler Error

Here is my code for path.cs

namespace TreehouseDefense
{
  class Path
  {
    private readonly MapLocation[] _path; 
// using underscore is a common convention in C#. It is helpful for distinguishing between instance variables anad metho variables. If we didn't have the underscore, noth path variables will have to be named differently or we would use this.path = path instead of _path = path

    public Path(MapLocation[] path)
    {
      _path = path;
    }

    public MapLocation GetLocationAt(int pathStep)
    {
      return (pathStep < _path.Length) ? _path[pathStep] : null; 
    }
  }
}

and here is the code for game.cs

using System;

namespace TreehouseDefense
{
    class Game
    {
        public static void Main()
        {
          Map map = new Map(8, 5);

          try
          {
            MapLocation[] path = {
              new MapLocation(0, 2, map),
              new MapLocation(1, 2, map),
              new MapLocation(2, 2, map),
              new MapLocation(3, 2, map),
              new MapLocation(4, 2, map),
              new MapLocation(5, 2, map),
              new MapLocation(6, 2, map),
              new MapLocation(7, 2, map),

            };
          }

          catch(OutOfBoundsException ex)
          {
            Console.WriteLine(ex.Message);
          }

           catch(TreehouseDefenseException ex)
          {
            Console.WriteLine("Unhandled TreehouseDefenseException");
          }

          catch(Exception)
          {
            Console.WriteLine("Unhandled Exception");
          }

        }
    }
}

I am getting the following warnings when I compile the code 

Game.cs(13,27): warning CS0219: The variable `path' is assigned but its value is never use
d                                                                                         
Game.cs(31,44): warning CS0168: The variable `ex' is declared but never used              
Tower.cs(7,13): warning CS0219: The variable `tower' is assigned but its value is never us
ed                                                                                        
Compilation succeeded - 3 warning(s)

Please explain the reason for the warning as my code is the same as the code shown in the video.

2 Answers

Samuel Savaria
Samuel Savaria
4,809 Points
Samuel Savaria
Samuel Savaria
4,809 Points

These aren't errors, these are warnings. Your code will compile and run without any problem, the console is simply trying to warn you about possible problems.

warning CS0219: The variable `path' is assigned but its value is never used

Here you created a new path but never used it anywhere in your code. The code will still work and you will use that variable in the course but right now the console doesn't understand why you created a variable that you don't use and is warning you that you might have forgotten to reference it somewhere.

Game.cs(31,44): warning CS0168: The variable `ex' is declared but never used

Same thing here. You created a variable that you aren't using yet. Like before, you will use it later on in this course.

elomaur
elomaur
5,276 Points
elomaur
elomaur
5,276 Points

Thank you for the response. I was curious as to why I was receiving these warnings when the code was the same as the code used in the video. I apologize for the misleading title. I am indeed aware that these are not errors.