User Account

All Pages

Expression Tree, Programming Languages

Assignment Help:
For this assignment you will read a file expression.txt and create an expression tree. The expression will be a valid infix expression with the all the necessary parentheses so that there is no ambiguity in the order of the expression. You will evaluate the expression and print the result. You will also write the prefix and postfix versions of the same expression without any parentheses.

In an expression tree the nodes are either operators or operands. The operators will be in the set [''+'', ''-'', ''*'', ''/'']. The operands will be either integers or floating point numbers. All the operand nodes will be leaves of the expression tree. All the operator nodes will have exactly two children.

The outline of your program will be as follows:

class Stack (object):

class Node (object):

class Tree (object):
def __init__ (self):

def createTree (self, expr):

def evaluate (self, aNode):

def preOrder (self, aNode):

def postOrder (self, aNode):

def main():

main()
The function createTree() will take as input parameter an infix expression with parentheses as a String and create an Expression Tree from it. Assume that the expression string is valid.

You will take the expression string and break it into tokens. There are four different kinds of tokens - left parenthesis, right parenthesis, operator, and operand. When we read a left parenthesis we are starting a new expression and when we read a right parenthesis we are ending an expression. Here is the algorithm that you will use:

If the current token is a left parenthesis add a new node as the left child of the current node. Push current node on the stack and make current node equal to the left child.
If the current token is an operator set the current node''s data value to the operator. Push current node on the stack. Add a new node as the right child of the current node and make the current node equal to the right child.
If the current token is an operand, set the current node''s data value to the operand and make the current node equal to the parent by popping the stack.
If the current token is a right parenthesis make the current node equal to the parent node by popping the stack if it is not empty.
For the input file this is what your program will output:

( ( 8 + 3 ) * ( 7 - 2 ) ) = 55

Prefix Expression: * + 8 3 - 7 2

Postfix Expression: 8 3 + 7 2 - *

Related Discussions:- Expression Tree

Simple encryption, i have to make a program that encrypt a text to numbers,...

i have to make a program that encrypt a text to numbers, i don''t know what is wrong in my code, the example of what i need: text: hi >> number: 17 23

To execute other program from already executing shell script, Normal 0 ...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Write a recursive procedure that computes number in integer, (a) Write a re...

(a) Write a recursive procedure (digits n) that computes the number of digits in the integer n using a linear recursive process. For example, (digits 42) should return 2 and (digit

Query a SPARQL endpoint using JENA JAVA API, program the following exercise...

program the following exercises using JAVA and JENA API: SPARQL endpoint to be queried: QUERY:">http://services.data.gov.uk/education/sparql QUERY: What are the school’s names th

Temperature Calculation system, Detailed Description: • The program will t...

Detailed Description: • The program will take temperature readings as input from user for specified number of consecutive days. • Program will store these temperature values into

Develop an html document with a nested list, 1. Develop a Web page, indicat...

1. Develop a Web page, indicating an ordered list of the names of your five friends. 2. Develop an HTML document with a nested list indicating the content page of any book 3.

What is the switch statement, What is the switch Statement? This is a dif...

What is the switch Statement? This is a different form of the multi way decision that It is well structured, but can only be used in certain cases where: 1. Here, Only one var

Java source code classes and objects, Design and implement a stringed music...

Design and implement a stringed musical instrument class using the following guidelines: a. Data fields for your instrument should include number of strings, an array of stri

Java interfaces, Expertsmind brings you unique solution in java assignment...

Expertsmind brings you unique solution in java assignments Interfaces A program in the Java selection language is a fuzzy type that is used to specify a program (in the ge

Define call by value - computer programming, Define Call by value - Compute...

Define Call by value - Computer Programming? Functions are raise by writing their name and an appropriate list of arguments within parenthesis. Usually these arguments are in t

Write Your Message!

Captcha
Order Assignment

Featured Services

Order Now

Popular Subjects

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +91-977-207-8620

Phone: +91-977-207-8620

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd