ALLEGRO_PI

Allegro 5 API

Provided by: allegro5-doc (Version: 2:5.0.11-2)
Source: allegro5
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SYNOPSIS

#include <allegro5/allegro.h>
#define ALLEGRO_PI        3.14159265358979323846

DESCRIPTION

C99 compilers have no predefined value like M_PI for the constant π, but you can use this one instead.