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From: pim@ele.tue.nl (Pim Buurman)
Newsgroups: comp.sys.alliant
Subject: Unsigned comparison in FX/C.
Message-ID: <489@al.ele.tue.nl>
Date: 2 May 90 12:09:27 GMT
Sender: pim@ele.tue.nl (Pim Buurman)
Organization: Eindhoven University of Technology, The Netherlands
Lines: 27

I discovered today a bug in the FX/C compiler, V2.1.23 .
It seems that (unsigned int) 0 < (unsigned int) 0 yields TRUE !!
Try this program and see what happens.

main()
{
	unsigned int ar[20];
	unsigned int i, j, swap;

	for (i = 1; i < 10; i++ ) {
		for (j = 0; j < i/2; j++ ) {
			if ( j > 12 )
				break; /* To stop sometime */
			swap = ar[j];
			ar[j] = ar[i-j-1];
			ar[i-j-1] = swap;
			printf( "%d %d\n", i, j );
		}
	}
}

If someone can confirm this error, would he mail me the result ?

Thanks, Pim.

Pim Buurman.						pim@ele.tue.nl
Eindhoven Univ. of Tech., Design Automation Section (ES).