On Mon, 19 Mar 2007, Orin Eman wrote:

> Some compilers turn c <<= 1 into c = (int)c << (int)1 and throw
> warnings if c is smaller than int, but don't throw the warning on c =
> c << 1.

As far as C is concerned, there is no difference between

c <<= 1;

and

c = c << 1;

when "c" is a char.  "c" will be promoted to an "int" in either case.
"1" is always an "int", so it is not promoted.

If your compiler issues diagnostics on one and not the other, I would
call it a bug in the compiler, though you really don't want to be
doing shift operations on a "char" since C doesn't specify whether
it's signed or not.

--
John W. Temples, III
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