Nodes of different colours represent the following:
Solid arrows point from a file to a file which it depends on. A file
is dependent upon another if the latter must be compiled before the former
can be.
program volatile_doctestuse vecfor_R4Ptype(vector_R4P)::pt(0:3)real(R4P)::dpt(0)=5.3*ez_R4Ppt(1)=ex_R4Ppt(2)=ey_R4Ppt(3)=ex_R4P-ey_R4Pd=pt(0)%distance_to_plane(pt1=pt(1),pt2=pt(2),pt3=pt(3))print"(F3.1)",dendprogram volatile_doctest