For most games, you can get away with 3.14 but I usually use 3.14159 because that''s all I can usually remember without a calculator.

How about this:

In float.h on MSVC++ 6 the #defined digits of precision are 6 for floats and 15 for doubles. Stick ~20 digits in your #define/const, let the compiler sort out how much is used.

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I guess this is where most people put a famous quote...
"Everything is funnier with monkey''s" - Unknown

long doubles are 18 digits of precision.

Null and Void
At least I don't know COBOL...
http://www.crosswinds.net/~druidgames/

Just to confuse things more, here''s an interesting technique... Init a variable pi with:

pi = atan(1) * 4;