C preprocessor question
pedz at bobkat.UUCP
pedz at bobkat.UUCP
Thu Feb 5 03:11:50 AEST 1987
In article <55 at umich.UUCP> jtr485 at umich.UUCP (Johnathan Tainter) writes:
>The #if is not going to evaluate the expression (((0) << 8) | (0))
>The #if takes an expression defined (recursively) by:
>an <expression> is
> 1) an integer string
> or 2) (<expression> | <expression>)
> or 3) (<expression> & <expression>)
>and nothing else.
This may be how it works but is not how it is defined. The value
after the #if is suppose to be a constant expression. Constant
expressions include almost all of the operators including << and
?:. I refer you to K&R section 15 page 211. Notice that it is
suppose to include sizeof which cpp can not cope with either. i.e.
cpp is -----.
--
Perry Smith
pedz at bobkat
{ti-csl,infotel}!pollux!bobkat!pedz
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