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fixmul(3) Allegro manual fixmul(3) NAME fixmul - Multiplies two fixed point values together. Allegro game pro- gramming library. SYNOPSIS #include <allegro.h> fixed fixmul(fixed x, fixed y); DESCRIPTION A fixed point value can be multiplied or divided by an integer with the normal `*' and `/' operators. To multiply two fixed point values, though, you must use this function. If an overflow occurs, `errno' will be set and the maximum possible value will be returned, but `errno' is not cleared if the operation is successful. This means that if you are going to test for overflow you should set `errno=0' before calling fixmul(). Example: fixed result; /* This will put 30000 into `result'. */ result = fixmul(itofix(10), itofix(3000)); /* But this overflows, and sets `errno'. */ result = fixmul(itofix(100), itofix(3000)); ASSERT(!errno); RETURN VALUE Returns the clamped result of multiplying `x' by `y', setting `errno' to ERANGE if there was an overflow. SEE ALSO fixadd(3), fixsub(3), fixdiv(3), ex3buf(3), excustom(3), exfixed(3), exspline(3), exstars(3), exupdate(3) Allegro version 4.4.3 fixmul(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO
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