ANSI C questions (parameters, structure assignment)

[Henry Spencer]

In article <1081.26d26274 at desire.wright.edu> demon at desire.wright.edu writes:
>	1)	In standard C, when you pass a structure bigger than four
>longwords, is the structure passed as a value parameter, or just a pointer to
>the structure (thus making it a var parameter)?

When you pass a structure, it is passed by value, regardless of size.

>	2)	Are structure assignments allowed only for initializations
>or can I do:
>struct_thing = other_struct_thing;

Yes, you can.

>struct_thing -= still_more_struct;
>struct_thing *= even_more_struct;

No; plain assignment (and the implicit assignments in passing and
returning) are the *only* operators that work on whole structures.
-- 
Committees do harm merely by existing. | Henry Spencer at U of Toronto Zoology
                       -Freeman Dyson  |  henry at zoo.toronto.edu   utzoo!henry