ABC[1]

Leo Geurts, Lambert Meertens, Steven Pemberton

ABC is a simple interactive language designed for quick, easy programming. It includes a programming environment with syntax-directed editing, suggestions, persistent variables, multiple workspaces and infinite precision arithmetic.

"An Alternative Simple Language and Environment for PC's", Steven Pemberton, IEEE Software 4(1):56-64 (Jan 1987).

The ABC Programmer's Manual, Leo Geurts et al, Prentice-Hall, 1989.