global struct declarations

[Elliot Marks]

If a struct or its members are passed
to a function, must it be declared globally?

#include <stdio.h>
struct mystruct{
int a;
int b;
};
int structfunc(stru ct mystruct foo);

int main(void)
{
struct mystruct bar;
bar.a = 123;
bar.b = 456;
int sum = structfunc(bar) ;
printf("%d\n", sum);

return 0;
}

int structfunc(stru ct mystruct foo)
{
int sum = foo.a + foo.b;
return sum;
}

This code doesn't compile if the struct
declaration is moved inside main().

[Thomas Stegen]

Mark A. Odell wrote:

Elliot Marks <em****@email.n et> wrote in news:3F******** ******@email.ne t:

Mixing declarations and statements is also legal in C99, and may be
supported as a language extension by some pre-C99 compilers.

But you should avoid it if you're trying to write portable C90 code.

In the process of learning C I have never used anything but a
C99 compiler, so I had no idea that this was a portability issue.
Thanks for the info.

Really? Which one (e.g. vendor)? I've yet to come across a C99 compiler.

www.comeaucomputing.com

(I have nothing to do with these people FYI)

--
Thomas.