Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
sidd607
Group Title
how do you convert a string such as (2+3)*4+(4+5) to a list such as [[2,"+",3],"*",4,"+",[4,"+",5]] and evaluate the value of the expression??
 one year ago
 one year ago
sidd607 Group Title
how do you convert a string such as (2+3)*4+(4+5) to a list such as [[2,"+",3],"*",4,"+",[4,"+",5]] and evaluate the value of the expression??
 one year ago
 one year ago

This Question is Open

e.mccormick Group TitleBest ResponseYou've already chosen the best response.0
You would need to examine the string using some sort of a loop and find all the parenthesis first. This would allow you to build the order of operations into your evaluation system. In fact, working with the order of operations would be the real key. That would let you place things in the list in the order they need to be evaluated to get an answer. Also, your evaluation routine would need to loop or recurs based on if it finds a list within the list.
 one year ago

A.Avinash_Goutham Group TitleBest ResponseYou've already chosen the best response.0
use a stack..
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.0
@A.Avinash_Goutham He posted in the MIT 6.189 area, which is an Intro to Python class. In Python, the list can be used as a stack. With append() and pop() it becomes a LIFO data structure.
 one year ago

sidd607 Group TitleBest ResponseYou've already chosen the best response.0
i got the logic. But the problem is i am not being able to write the proper code.
 one year ago

e.mccormick Group TitleBest ResponseYou've already chosen the best response.0
Well, what did you come up with?
 one year ago

droopy4096 Group TitleBest ResponseYou've already chosen the best response.0
@sidd607 , while not my solution, here's what google brings up  http://stackoverflow.com/questions/2371436/evaluatingamathematicalexpressioninastring in other words  there is no simple solution to this as you have to parse numerical strings that can get pretty hairy...
 one year ago

goformit100 Group TitleBest ResponseYou've already chosen the best response.0
A warm Welcome to OpenStudy. I can help guide you through this useful site. You can ask your questions to me or you can message me. Please use the chat for off topic questions. Remember to give the person who helped you a medal by clicking on "Best Answer". We follow a code of conduct, ( http://openstudy.com/codeofconduct ). Please take a moment to read it.q
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.