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   myrmepropagandist (futurebird@sauropods.win)'s status on Saturday, 06-Dec-2025 16:21:31 JST myrmepropagandist

   The TI-34 is a fairly basic scientific #calculator. I’m a big fan because it’s easy to use and not overwhelming.

   I was reading the manual and discovered it has two functions:

   ipart(x)
   fpart(x)

   These return the integer and fraction parts of x.

   ipart(2.34)=2
   fpart(2.34)=.34

   Great! So, uh.. What are these typically used for? Why include them on such a *basic* calculator? #calculators #ticalc #ti34 #matheducation #mathchat

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     myrmepropagandist (futurebird@sauropods.win)'s status on Saturday, 06-Dec-2025 16:21:29 JST myrmepropagandist

     in reply to

     On a slight tangent I have just noticed that on the TI 84 int(x) is NOT the same as in python. Who is to blame for this? #ti84 #python #horror

     Steve's Place repeated this.
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     David Chisnall (*Now with 50% more sarcasm!*) (david_chisnall@infosec.exchange)'s status on Saturday, 06-Dec-2025 16:22:57 JST David Chisnall (*Now with 50% more sarcasm!*)

     in reply to

     @futurebird

     The TI calculator does what mathematics normally means (round to nearest).

     A programming language will do one of the things specified in IEEE 754 floating-point rounding modes. The default for Python (and C), I believe, is 'round towards zero', also known as truncation. This is implemented in floating point as a very simple normalisation operation (shift the mantissa so that the exponent is 1, which either shifts some zeroes in from the right or shifts some bits off to the right and loses them).

     The extra fun on the calculator might be that it's may be using some binary-coded decimal representation internally, because otherwise you have fun rounding errors from not being able to represent a lot of decimal fractions precisely in a binary floating-point value. More advanced calculators will store rational numbers fractions, which lets them avoid any precision loss until the final convert-to-decimal step that they do for display.