what is 'foo.c'?

[A2B]

In my book it refers to foo.c. I cannot understand what this is?

[Mark McIntyre]

A2B wrote:

In my book it refers to foo.c. I cannot understand what this is?

STFW!

http://www.hydroponicsearch.com/spel...strategy-exact

And even wikipedia gets this right..

http://en.wikipedia.org/wiki/Foo