C preprocessor evaluate sin() of constant

Question

Is there a way to convince the C preprocessor to evaluate a transcendental function of a constant at compile-time?

For example, replace (int)256*sin(PI/4) with 181. This will help me keep magic numbers out of my code.

If it makes a difference, I'm using MSPGCC 4.5.3 and I have no sin() or cos() available at runtime.

Answer 1

The C preprocessor can't provide sin() or cos().

For my applications, I use a perl script to create a separate .h file containing the needed precalculations. There are probably sexier ways to do it, but this integrates into my workflow well enough.