.\" Automatically generated by Pandoc 3.1.11.1 .\" .TH "ALLEGRO_PI" "3" "" "Allegro reference manual" "" .SH NAME ALLEGRO_PI \- Allegro 5 API .SH SYNOPSIS .IP .EX #include #define ALLEGRO_PI 3.14159265358979323846 .EE .SH DESCRIPTION C99 compilers have no predefined value like M_PI for the constant π, but you can use this one instead.