#🔒 Making an interpreter in python and having an issue with mathmatical operations

17 messages · Page 1 of 1 (latest)

young tartanBOT
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@full canyon

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full canyon
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Whenever i do the equation (5 + 5/5) * 5 * -10 it does not calculate the last multiplication it ends up just doing 5 + 5/5 and multiplying 5 and -10 making values be the list [6,-50] and returning 6

twin sigil
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at line 127 or so - I think one of the issues is that you're incrementing open_brackets more than once when it encounters a (

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you set it to 1 at line 130, and then the first if in the while will increment it a second time, because that token is still (

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actually, that might not be it, as you do increment the token marker i after the first (

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suggested debug: at the start of evaluate(), print out expression to ensure it is what you think it is

full canyon
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ok ill try that out really quick\

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so this is whats happening
Tokens: ['(', '5', '+', '5', '/', '5', ')', '', '5', '', '-10']
(5 + 5/ 5) * 5 * -10
Tokens: ['5', '+', '5', '/', '5']
5 + 5 / 5
Operators after evaluation: []
Values after evaluation: [6.0]
Operators after evaluation: []
Values after evaluation: [6.0, -50.0]

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at some point it calculates 5 * -10 but it never has the expression be 6 * 5 * -10

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@twin sigil do you think my stacks arent implemented properly

twin sigil
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well, it sounds like the way things are being coaelesced isn't working right

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take a look at that book I recommended, as they discuss how to implement stuff like this and many of the subtleties involved

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and how things like recursive evaluation of expressions can work

full canyon
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ok thank you

young tartanBOT
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