Provided by: allegro4-doc_4.4.2-10_all

**NAME**

fixmul - Multiplies two fixed point values together. Allegro game programming library.

**SYNOPSIS**

#include<allegro.h>fixedfixmul(fixedx,fixedy);

**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)