Re: [avr-gcc-list] long character constants like 'abcd'.. 2. try

[Matthias Ringwald]

Thanks for your answers..

To clarify a bit:

> What are you trying to do?

I want to use 32 bit constants that are made of 4 single characters.

For me 'abcd' represents the same value as ('a' << 24 | 'b' << 16 | 'c' 
<< 8 | 'd')
Its just a bit more readable and convenient.

(those type of constants are very common on the mac. they use it for 
file type, file creatures,
to enumerate stuff... etc...)

Anyway, I can compile:

#include <stdio.h>
int main()
{
        long id = 'asdf';
        printf("= %x" , id);
}

with my normal gcc compiler (2.95.2... ok, on my 32 bit  machine..) and 
the output is
= 61736466

I agree that 'abcd' is not a character, but I would say that 'abcd' 
represents an 32 bit constant and that
it could be handled by the preprocessor and/or the c-compiler, so I 
could use it in functions calls (or wherever).

For sure, I can create this value in a function like create_id( char a, 
char b, char c, char d)
my point is just about the fact that reading/writing

foo( 'abcd' , nar)

is much easier than

foo (create_id('a','b','c','d'), bar)

Another opinion?


Matthias
avr-gcc-list at http://avr1.org