man vector_length () - Calculates the length of a vector. Allegro game programming library.
NAME
vector_length, vector_length_f - Calculates the length of a vector. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
fixed vector_length(fixed x, fixed y, fixed z);
float vector_length_f(float x, float y, float z);
DESCRIPTION
Calculates the length of the vector (x, y, z), using that good 'ole Pythagoras theorem.