fixmul(3alleg4) Allegro manual fixmul(3alleg4) NAME fixmul - Multiplies two fixed point values together. Allegro game programming 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(3alleg4), fixsub(3alleg4), fixdiv(3alleg4), ex3buf(3alleg4), excustom(3alleg4), exfixed(3alleg4), exspline(3alleg4), exstars(3alleg4), exupdate(3alleg4) Allegro version 4.4.3 fixmul(3alleg4)