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Topic: REMOVE PARENTHESES (Read 11024 times) |
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arvindwu
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REMOVE PARENTHESES
« on: Nov 1st, 2008, 1:56am » |
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how to remove redundent parentheses
(A+B) = A+B
(A+(B*C) ) = A+B*C
((A+B)*C) = (A+B)*C
A/(B+C) = A/(B+C)
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towr
wu::riddles Moderator
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Re: REMOVE PARENTHESES
« Reply #1 on: Nov 1st, 2008, 4:13am » |
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Build a tree from the expression, and then use precedence rules:
C\P + - * /
+: _ r lr lr
-: _ r lr lr
*: _ _ _ r
/: _ _ _ r
e.g. If the parent node (P) has the operator *, then a child (C) with operator + needs to be enveloped in parentheses when it's either the left (l) or right (r) child.
If the parent node (P) has the operator /, then a child (C) with operator * needs to be enveloped in parentheses only if it's the right (r) child, but not when it's the left (l).
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| « Last Edit: Nov 1st, 2008, 4:14am by towr » |
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towr
wu::riddles Moderator
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Re: REMOVE PARENTHESES
« Reply #2 on: Apr 5th, 2013, 6:21am » |
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I'm getting the distinct impression you're just spamming... I can't remember any of your posts contributing anything, it's all "I agree", "thanks", "I didn't know that".
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Grimbal
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Re: REMOVE PARENTHESES
« Reply #3 on: Apr 7th, 2013, 7:09am » |
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Me too. I even started to removed this kind of posts where there is no contribution to the subject.
PS: oops, I was cleaning up this kind of messages and I accidentally deleted the message you were commenting on.
For info, towr was replying to Mariko79 who just quoted towr's previous message and said something like "Thanks, buddy".
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| « Last Edit: Apr 7th, 2013, 8:56am by Grimbal » |
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