Code optimization

Question

When i\'m trying to optimize my code, I often run into a dilemma:

I have an expression like this:

int x = 5 + y * y;
int z = sqrt(12) + y * y;
         


        

Answer 1

You don't need a temporary variable:

int z = y * y;
int x = z + 5
z = z + sqrt(12);

but the only way to be sure if this is (a) faster and (b) truly where you should focus your attention, is to use a profiler and benchmark your entire application.