IsUnsigned() function?

[netnews dptg]

How about this:

	IsUnsigned (a) 
	int a;
	{
		return( !(a >> ((sizeof(int)*8)-1)));
	}

The only real assumption that this function makes is that
there are 8 bits in a byte (a fair assumption I think).

If you don't care about portability (I do, though) and like to make
more assumptions (like the size of the int on your system)
you can make it even shorter:

4 byte int:

	IsUnsigned (a) 
	int a;
	{
		return( !(a >> 31));
	}

2 byte int:

	IsUnsigned (a) 
	int a;
	{
		return( !(a >> 15));
	}

BTW: What you have experienced says much more about Microsoft than
     about yourself. Don't let it eat you.

Ralph Hayon
AT&T Bell Laboratories, 
Middletown, NJ