ALLEGRO_PI
#define ALLEGRO_PI 3.14159265358979323846C99 compilers have no predefined value like M_PI for the constant π, but you can use this one instead.
Examples: ex_bitmap_target, ex_blend2, ex_blend_bench, ex_blit, ex_clip, ex_filter, ex_glext, ex_haiku, ex_lines, ex_logo, ex_opengl, ex_premulalpha, ex_prim, ex_synth, ex_threads
Most helpful discussions:
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