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C# Intermediate C# Polymorphism Virtual Methods

Posted by Michael Mansperger
Michael Mansperger
2,623 Points

Error: Class, struct, or interface method must have a return type.

I keep getting this error for the SheildedInvader constructor. I can't tell what I'm missing. I named the class ShInvader. namespace TreehouseDefense { class ShInvader: Invader { private static System.Random _random = new System.Random();

  public ShInvader(Path path) : base(Path){}

  public override void DecreaseHealth(int factor)
   {         
     if(_random.NextDouble() < .5)
      {
       base.DecreaseHealth(factor);
      }
     else
     {
       System.Console.WriteLine("Shot blocked by sheild!!!");
     }
   }

} }

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

To facilitate a complete analysis, make a snapshot of your workspace and post the link to it here.

Michael Mansperger
Michael Mansperger
2,623 Points

Workspace Snapshot: https://w.trhou.se/wrxguetvhf

1 Answer

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

The code shown here is not exactly the same as what you were working with in your workspace. As shown above, the class name is "ShInvader". But in the actual ShInvader.cs file in the workspace, the class name is just "Sh". This conflicts with the constructor name and causes the error.

Also, when the constructor calls the base, it should pass the variable "path" instead of the type "Path".

Michael Mansperger
Michael Mansperger
2,623 Points

I got a new error: 'TreehouseDefense.path is a 'type' but a variable was expected. Its the constructor again.

https://w.trhou.se/wrxguetvhf

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

A "snapshot" freezes the state of the project, so if you make changes, you'll need to make a fresh snapshot to share them.

But isn't this what I mentioned on the last line of my original answer? Have you made that change yet?