Question

For example I have a float 55.2f and want to round it down such that the result can be divided by two without rest.

So 55.2 would become 54 as that is the nearest smaller “step” that can be divided by two. Is there a function for this or must I write my own algorithm?

Answer 1

If your result must remain a float, you can do:

float f=55.2f;
f=floorf(f/2.f)*2.f;