... it is a fundamental principle of testing that you must know in advance the answer each test case is supposed to produce. If you don't, you are not testing; you are experimenting.

C is a razor-sharp tool, with which one can create an elegant and efficient program or a bloody mess.

Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.

The most effective debugging tool is still careful thought, coupled with judiciously placed print statements.

If you're as clever as you can be when you write it, how will you ever debug it?

Get the weirdnesses into the data where you can manipulate them easily, and the regularity into the code because regular code is a lot easier to work with

An effective way to test code is to exercise it at its natural boundaries