digraph G {
  size ="4,4";
  main [shape=box]; /* this is a comment */
  main -> parse [weight=8];
  parse -> execute;
  main -> init [style=dotted];
  main -> cleanup;
  execute -> { make_string; printf}
  init -> make_string;
  edge [color=red]; // so is this
  main -> printf [style=bold,label="100 times"];
  make_string [label="make a\nstring"];
  node [shape=box,style=filled,color=".7 .3 1.0"];
  execute -> compare;
}