[c-forum] Re: [c-prog] how to find size without using sizeof??

[John Matthews]

--- In c-prog@yahoogroups.com, Ganesh Kundapur <[EMAIL PROTECTED]> wrote:
>
> #define SIZEOF(var) ((size_t)(&(var)+1)-(size_t)(&(var)))
>         printf ( "sizeof int = %d\n", SIZEOF(int));
> $$ cc sizeof.c
> sizeof.c: In function âmainâ:
> sizeof.c:20: error: invalid lvalue in unary â&â
> sizeof.c:20: error: expected expression before â)â token

#define SIZEOF_TYPE(type) ((size_t)(((type *)0 + 1)) - (size_t)(((type
*)0)))

sizeof int = 4

Of course this only works for types, not both types and variables.