void datatype

ok ... the trouble started with sizeof(void) = 1

on similar terms sizeof empty class/structure in C++ is also 1

Bjarne Stroustrup's FAQ reasons: "To ensure that the addresses of two different objects will be different. " taken from here

but I cannot use the same reasoning for void ... since I cannot create variables of void type

void x ; <does not hold>

> the trouble started with sizeof(void) = 1
Says who?

Code:

---

#include <stdio.h>
#include <stdlib.h>

int main ( ) {
    printf("%d\n", sizeof(void) );
    return 0;
}

---

gcc reports
foo.c:5: warning: invalid application of `sizeof' to a void type

vc6 reports either
foo.c(5) : warning C4034: sizeof returns 0
foo.c(5) : error C2070: illegal sizeof operand

You can't have a variable with void type, even if your compiler apparently gives it a non-zero size.

> on similar terms sizeof empty class/structure in C++ is also 1
But C can't have an empty struct.

thank you! , solves all the troubles

btw... what is the difference between -pedantic and -Wall arguments in gcc ?

I have been using -Wall instead of -pedantic ... so the warnings were bypassed

The gcc manual page explains all.