man fixhypot () - Fixed point hypotenuse. Allegro game programming library.
NAME
fixhypot - Fixed point hypotenuse. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
fixed fixhypot(fixed x, fixed y);
DESCRIPTION
Fixed point hypotenuse (returns the square root of `x*x + y*y'). This should be better than calculating the formula yourself manually, since the error is much smaller.