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

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

Prolog predicate for list that contains duplicate elements, Write a Prolog ...

Write a Prolog predicate  has_duplicates(L)  that is true if list  L  contains duplicated elements (that is at least 2 copies of an element). For instance: ?- has_duplicates([a,

ARM LANGUAGE, I WANT TO MAKE PROJECT IN ARM LANGUAGE CAN YOU HELP ME

I WANT TO MAKE PROJECT IN ARM LANGUAGE CAN YOU HELP ME

Lalr parser - xml table output, LALR Parser: Rule Table - Contains de...

LALR Parser: Rule Table - Contains definitions of production rules within the grammar. Attributes: Count - Number of production rules in the table Child items:

Pascal, how do i make a bomber game using pascal on a software called lazur...

how do i make a bomber game using pascal on a software called lazuras

Object-oriented languages, Object-oriented languages Languages that sup...

Object-oriented languages Languages that support OOP features can be classified into the following two categories: 1.    Object-based programming languages, and 2.      O

Create an application to run in the amazon ec2 service, In this assignment ...

In this assignment you will create an application to run in the Amazon EC2 service and you will also create a client that can run on local machine and access your application. You

Write a program to illustrate the call by value, Write a Program to illustr...

Write a Program to illustrate the call by value? #include . int compute_sum(int m); int main( void) { int n=3, sum; printf("%d\n",n); /*3 is printed */ sum=compute_sum(n

Oracle , PLEASE HELP ME ORACLE PROGRAMING TRIGGER

PLEASE HELP ME ORACLE PROGRAMING TRIGGER

Write an implementation for the prime machine, You should use the BToolkit ...

You should use the BToolkit to produce the answers to the questions below. Where applicable, please use the machine names and identifier names suggested in the question to help me

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