Treebeard's String-Math

[Pete]

As is, it just appears as such an odd way to express using strings to perform basic math functions. I looked at the 24 digit sets, all from one continuous string, and all using the division sub routines to increase the size of the quotient, which is passed back as outs and passed back again as r. Add together each set and it gives the next 24-digit set. As such, I cannot see a practical way to have it demonstrate the four various math routines with the subroutines in the code; so I guess what I would like to see it do is handle user input to demonstrate this is a number multiplied by another number with another number subtracted from it, divided by ant=other number, and added to another number, etc. Also, how it handles negatives and decimals.

Pete