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Looks like Lisp, ugh ;) I guess Polish Notation wasn't as uncommon in the 70's as it is today, AFAIK pocket calculators used this too. And once you switch your

• b112 4y ago
  And once you switch your mind over it feels just natural. Yet what if the result is, your mind has become unnatural? !!!
  • 0x445442 4y ago
    RPN with pocket calculators was nice because of the screen real estate restrictions. But on computers there’s a lot of screen real estate to show the program and the variable assignments to intermediate results. Even with long procedures, it’s easy to scroll, read and understand the execution flow with that extra screen space.
• dandanua 4y ago
  The reverse Polish notation (postfix) is the most natural notation if you want just to compute things, IMO. But if you want to grasp what is going on without computation - other notations can be better for readability.