The fault is entirely mine
Robert,
I knew that the HabitableZone's posts go through an HTML filter. It was stupid of me to have forgotten that when I wrote the earlier post.
How did you get that [pointy bracket] to appear in your previous post?
I'll send the C code toy to you by uuencoded e-mail. It's easy for the toy's source code to be corrupted by embedded blanks which is why I'm sending it uuencoded.
Yesterady I blew another half hour through a human factor's weakness in the user interface. The "Clear" button is directly above the "Post" button. The "Clear" button should be in the corner diagonally across from the "Post" button to discourage pressing it by accident.
Gary