OK, you standards gurus, here's a question?
Should printf print the sign of -0.0?
Since IEEE has negative 0 I think it should, but what does the standards say.

Here's a program that illustrates the question:

#include <math.h>
main()
{
        double x = -1, y = 0;
        printf("%g %g\n", x, y);
        printf("%llx %llx\n", x, y);
        y = copysign(y, x);
        printf("%g %g\n", x, y);
        printf("%llx %llx\n", x, y);
}

    -- Lennart