A tiny stack calculator

Evaluate sums like "3 4 + 2 *" with a stack, the way old calculators and many virtual machines work, printing the stack at every step.

C15 minCode

Code

Inside: a 69-line program to run and change.

Code editor. Press Control or Command plus Enter to run the code. Tab indents; to move focus out of the editor, press Escape and then Tab.