## WTF: A DSL for hand-written 4-function calculators

In one sense, this is light enough that I feel bad posting it to LtU. In another, though, it's entirely relevant: this guy started out inventing a DSL for pen-strokes, combinations of them, and relations between these combinations, and ended up with a simple OCR-based 4-function calculator. This was one of the cleverest bits of just-because programming language work and contrived abstraction that I've seen in a long time. Sample:

   Zero is
a large circle

One is
either
a long vertical line
or
a long vertical line
a very small slash line
top of first joins top of second


## Comment viewing options

### That's neat.

And he wrote his four function calculator with 4000 lines of C++.

I wonder if the "OMGWTF Programming Contest" is going to become a yearly event, like the ICFP Programming Contest?