Conversions/casts one more time

[Wendy Thrash]

Keywords:


My program:
>> unsigned char ucf() { return 0xaa; }
>> 
>> main() {
>> 	char c;
>> 	unsigned char uc = 0xaa;
>> 
>> 	c = uc;
>> 	printf("\tc = %x, (char)uc = %x, (char)ucf() = %x\n",
>> 	  c, (char)uc, (char)ucf());
>> }

Adam Reed (mtund!adam) writes:
>Ugh. %x expects an int, so the result of feeding it a char is,
>*and ought to be*, UNDEFINED.

Golly!  Guess they've changed the language on me again.  Last I heard,
char variables were converted to int whan passed as parameters.  That meant
that when I did something like this I could see what the compiler produced
when it converted the expression to int.  Guess I'll have to go back to writing
	int i, j, k;
	...
	i = c;
	j = (char)uc;
	k = (char)ucf();
and looking at the result with adb.  It's SO hard to keep up with these things!

In case anyone wonders, the point of this question was that the 4.3 VAX C
compiler sometimes throws away casts when it's doing promotions.  I don't
believe this is correct, and those who have addressed that issue (by mail as
well as by posting) have agreed.  Thanks to all of you who wrote.