this post was submitted on 30 Mar 2025
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I bought a cheap scientific calculator for math class. When I tried to multiply .5 by .5 it gave a long irrational number instead of .25. then I had to try to explain to the store clerk why that was wrong before they would accept the return
This reminds me of a story with an old high school maths teacher.
Someone said a number divided by zero was zero and he proceeded to explain why it was not. One of the class jokers went "oh yeah, well my calculator says it's zero!". The teachers smiles and says "surely not" and approaches the joker to see what kind of shenanigan he was pulling. And sure as hell he divides five by zero and zero is the result. The teacher, not believing his own eyes, looks at the calculator, then the joker, then the calculator again. The window was open. Figure out the rest yourself.
Ah floating point math. Works fine for 90% of use cases, until it doesn't.
Hmm really? It's always worked for 90.0001741894164% of use cases for me
You got an audible chuckle from me on that one
Better calculators just use floating point math with a few tricks on top to pretend it isn't floating point math.
Weirdly though it wasn't remotely close to the right answer so I don't think it was floating point malarkey. I always assumed some defect but I guess we'll never know.now I wish I had kept it so I could have sent it to Matt Parker for his calculator reviews
First gen Pentium seems like it would be overkill for a scientific calculator but I guess they had to offload those chips somehow.
The ti-84 plus is based on the zilog z80. From 1976. The calculator is still being made, and still costs $100.