more questions about efficient C code

[Eugene D. Brooks III]

> >>	if ((fp = fopen("foo", "r") == NULL) {
> 	This example bothers me.  I'm not sure what all makes up the
> 	fopen subroutine, but the addition or subtraction of one measely
> 	assignment statement *has* to be negligible when compared to what
> 	goes on in fopen.  Even if that code is in the innermost of inner
> 	loops, the "optimization" will still be unnoticable.  I know
> 	it's just an example of an assignment within a boolean expression,
> 	but I see a *lot* of programs with that same code.  Are we really
> 	gaining anything, or is it merely psychological?

Its its not for the sake of exectution efficiency.  You see it
a lot for the sake of statement efficiency.  Its the efficient and STANDARD
way of saying it.  Any experienced C programmer recognizes this code
automatically and produces it without thinking.  You have problems with
it because you are not an experienced C programmer yet.

You of course need to include the missint paren :-)