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Comments should say what the code does. If you wrote the code, do you know what you wanted the code to do and how the code was going to do that?

If you didn't write the code, then maybe you should...

Sorry, why can't you add the comments in your last post to the code?

The comments in a piece of code should come from the design for the code.
If you have defined what the code should do, add the thoughts that describe that design as comments to the code.

How can...