laura_rand@xxxxxxxxxxxxxxxxx writes: > > > i could not find an answer to this question on the net so i'm posting it > > > here. > > > > > > as far as i know, the Ansi C standard does not specify the order of > > > evaluation of expression arguments. so if i wrote: > > > > > > x = f() + g() > > > > > > it would be up to the compiler whether f() or g() would be called > > > first. > > [snip] > > > > There is no order you can depend on. It can vary by platform, and > > according to optimization flags. > > that was my question. which optimization flags does it depend on, and how? > platform is intel x86. It is a reasonable question, but unfortunately I do not think there is any simple answer. Since the standard does not specify an order for the evaluation, it is not something which the compiler, or any compiler writer, pays attention to. I recommend that you compile an example using various differents sets of options, and look at the generated assembler code to see what happens. It may be that you always get the same result. It may be that you get different results from different options. Naturally the results you get now may change with other versions of the compiler. I'm sorry that I can't be more helpful. Ian
