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fixmul.3alleg
Langue: en
Version: version 4.2.2 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
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(3alleg), fixsub(3alleg), fixdiv(3alleg), ex3buf(3alleg), excustom(3alleg), exfixed(3alleg), exspline(3alleg), exstars(3alleg), exupdate(3alleg)Contenus ©2006-2024 Benjamin Poulain
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