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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
199087 changed files with 3378941 additions and 0 deletions
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34
Task/Arithmetic-evaluation/Mathematica/arithmetic-evaluation-1.math Normal file
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(*parsing:*)
parse[string_] :=
Module[{e},
StringCases[string,
"+" | "-" | "*" | "/" | "(" | ")" |
DigitCharacter ..] //. {a_String?DigitQ :>
e[ToExpression@a], {x___, PatternSequence["(", a_e, ")"],
y___} :> {x, a,
y}, {x :
PatternSequence[] |
PatternSequence[___, "(" | "+" | "-" | "*" | "/"],
PatternSequence[op : "+" | "-", a_e], y___} :> {x, e[op, a],
y}, {x :
PatternSequence[] | PatternSequence[___, "(" | "+" | "-"],
PatternSequence[a_e, op : "*" | "/", b_e], y___} :> {x,
e[op, a, b],
y}, {x :
PatternSequence[] | PatternSequence[___, "(" | "+" | "-"],
PatternSequence[a_e, b_e], y___} :> {x, e["*", a, b],
y}, {x : PatternSequence[] | PatternSequence[___, "("],
PatternSequence[a_e, op : "+" | "-", b_e],
y : PatternSequence[] |
PatternSequence[")" | "+" | "-", ___]} :> {x, e[op, a, b],
y}} //. {e -> List, {a_Integer} :> a, {a_List} :> a}]
(*evaluation*)
evaluate[a_Integer] := a;
evaluate[{"+", a_}] := evaluate[a];
evaluate[{"-", a_}] := -evaluate[a];
evaluate[{"+", a_, b_}] := evaluate[a] + evaluate[b];
evaluate[{"-", a_, b_}] := evaluate[a] - evaluate[b];
evaluate[{"*", a_, b_}] := evaluate[a]*evaluate[b];
evaluate[{"/", a_, b_}] := evaluate[a]/evaluate[b];
evaluate[string_String] := evaluate[parse[string]]

2
Task/Arithmetic-evaluation/Mathematica/arithmetic-evaluation-2.math Normal file
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parse["-1+2(3+4*-5/6)"]
evaluate["-1+2(3+4*-5/6)"]