Believe the terrain, not the map

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

If you had done something twice, you are likely to do it again.

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

Do what you think is interesting, do something that you think is fun and worthwhile, because otherwise you won't do it well anyway.

Trying to outsmart a compiler defeats much of the purpose of using one.

Some compilers allow a check during execution that subscripts do not exceed array dimensions. This is a help, but not sufficient. First, many programmers do not use such compilers because They're not efficient. (Presumably, this means that it is vital to get the wrong answers quickly.)