ALLEGRO_PI - Allegro 5 API
Contents
Description
C99 compilers have no predefined value like M_PI for the constant π, but you can use this one instead.
Allegro reference manual ALLEGRO_PI(3alleg5)
Name
ALLEGRO_PI - Allegro 5 API
Synopsis
#include <allegro5/allegro.h>
#define ALLEGRO_PI 3.14159265358979323846
