ABC Intepreter: Execution

Abstract

In this final chapter we’ll look at an example to show how the interpreter executes a command. I’ll also write down the full code, and describe a short interactive session using the interpreter. But first, let me state in more detail the subset of ABC that the interpreter can handle.

The executioner’s argument was, that you couldn’t cut off a head unless there was a body to cut it off from: that he had never had to do such a thing before, and he wasn’t going to begin at his time of life.

The King’s argument was, that anything that had a head could be beheaded, and that you weren’t to talk nonsense.

The Queen’s argument was, that if something wasn’t done about it in less than no time, she’d have everybody executed, all round.

Alice’s Adventures in Wonderland