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_R16Ptype(vector_R16P)::pt(0:2)real(R16P)::dpt(0)=5.3*ez_R16Ppt(1)=ex_R16Ppt(2)=ey_R16Pd=distance_to_line_R16P(pt(0),pt1=pt(1),pt2=pt(2))print"(F3.1)",dendprogram volatile_doctest