add
and
subtract
are looking incredibly the same.
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Your code do not behave the way you expect, and you don't understand why !
There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.
Debugger - Wikipedia, the free encyclopedia[
^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[
^]
The downside of this solution:
- It is a DIY, you are the one tracking the problem and finding its roots, which lead to the solution.
The upside of this solution:
- You see your code behavior, you match it against your expectations.
secondary effects
- Your will be proud of finding bugs yourself.
- Your skills will improve.
You should find pretty quickly what is wrong.