ALLEGRO_PI(3) Library Functions Manual ALLEGRO_PI(3) NAME ALLEGRO_PI - Allegro 5 API SYNOPSIS #include <allegro5/allegro.h> #define ALLEGRO_PI 3.14159265358979323846 DESCRIPTION C99 compilers have no predefined value like M_PI for the constant I, but you can use this one instead. Allegro reference manual ALLEGRO_PI(3)
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