Basic

When I was learning basic I created a program that added time.
Such as:

1 hour 20 minutes and 13 seconds
+
2 hours 30 minutes and 12 seconds
+
14 hours 2 minutes
+
20 hours

=
and then I would get an answer when I hit the return key

I created the program in MS Basic, Turbo Pascal and Exel

the program worked the same in each program.

I saved the program to disk and I made paper copies of the formula but I lost them all. I think they are somewhere on a 3 1/2 inch disk.