Quick question about the c compiler

[DtY]

I guess this is more a question of what C compilers generally do, but also specifically how gcc will do it.

If you do some basic math on two constants, will it be evaluated at compile time, or at run time, like:

C:

#include <stdio.h> #define WIDTH 800 int main(void) {     int x = WIDTH-64;     printf("%d",x);     return 0; }

Would it be compiled as "make x 800-64", or would the compiler see two constants, and take care of that step itself, "make x 736"?

[Zeroth]

A neat little command switch for gcc is -S which translates the source code to assembly code. Looking at the assembly code, I see that GCC, on my computer at least, precalculated the value of the variable, because GCC will try to do as many math operations as it can ahead of time.

[DtY]

Ah, thanks