Make C floating point literals float (rather than double)

Question

It is well known that in C, floating point literals (e.g. 1.23) have type double. As a consequence, any calculation that involves them is promoted

Answer 1

You can cast the defined constants to (float) wherever they are used, the optimizer should do its job. This is a portable solution.

#define LIMIT 2.5

if (x < (float)LIMIT) ...