🚀 go-pugleaf

Hi!

I have a few questions for the ANSI/ISO C gurus:

(1). Is there a rule in the C standard stating that the address of *every*  
structure - irrespective of its contents - should satisfy some alignment  
requirement? For example, is the following guaranteed to work?

	struct a { char data[sizeof(double)]; } ana;
	struct b { double data; };

	int main()
	{
		((struct b *) &ana)->data = 42.42;
		return 0;
	}

(2). If the answer to (1) is no, then is a conforming compiler allowed to  
assign some specific alignment requirement to a data type, just because it  
is defined as a structure, and again irrespective of the contents of the  
structure? For example, if I write:
	
	#include <stdio.h>

	struct c { char data; } carray[10];

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

would it be legal for this program to print something other than 10?

(3). If the answer to (2) is yes, why would a compiler want to do this?

Thanks in advance,

- Wil

Wil Evers, <wil@ittpub.nl>
ITT Publitec Research and Development BV, Amsterdam, Holland