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[-] brown567@sh.itjust.works 38 points 2 days ago

2 5 8 5 - × + for you RPN fans =)

[-] chonglibloodsport@lemmy.world 4 points 2 days ago

Actually:

2 5 8 5 - x +

10 keystrokes

I use RPN on my phone calculator for fun but it can also be annoying sometimes.

On my CASIO FX-260 Solar II calculator (super cheap, really nice and simple but also powerful) that would be:

2 + 5 ( 8 - 5 ) =

9 keystrokes

[-] excral@feddit.org 4 points 2 days ago

You could do

8 <enter> 5 - 5 × 2 +

-> 8 keystrokes

[-] oatscoop@midwest.social 2 points 2 days ago
[-] chonglibloodsport@lemmy.world 2 points 2 days ago

But that’s a specific optimization where you can no longer read the numbers left to right, the original intent of RPN.

[-] Nindelofocho@lemmy.world 3 points 2 days ago

Im terrible at math, what is this though?

[-] MimicJar@lemmy.world 24 points 2 days ago* (last edited 2 days ago)

RPN or Reverse Polish Notation is a notation for calculators to be less ambiguous. The last numbers use the operator to their right, repeat. So no need for parenthesis or PEMDAS.

  • 2 5 8 5 - × +
  • (8 - 5 = 3)
  • 2 5 3 × +
  • (5 × 3 = 15)
  • 15 2 +
  • (15 + 2 = 17)
  • 17
[-] Nindelofocho@lemmy.world 5 points 2 days ago

This might actually help me thank you!

this post was submitted on 27 Nov 2025
718 points (91.3% liked)

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