HW3_expressions.pdf - COSC 2320 Data Structures Homework 3...

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COSC 2320: Data Structures Homework 3: List Expression Evaluation Using Stacks Deadline: Oct. 25, 2014 1. INTRODUCTION You will create a C++ program to evaluate expressions combining set union, set intersection and parentheses. The program must exploit a stack to convert the expressions from infix notation to postfix notation and a second stack to evaluate the postfix expression. 2. INPUT & OUTPUT The input of the program is a text file with multiple commands and expressions to be executed or evaluated by the program, one command or expression per line. The commands and expressions are defined as follows: Read [ file name ] [ list name ] Read the specified file from disk and insert each word in the file into a doubly linked list named as [ list name ] . The file specified in this command, if exists, will be a text file, with an unbounded number of different words (case-sensitive), separated by spaces, commas or periods. The input file can have several lines terminated by carriage returns. You can assume words will be at most 50 characters long and no special characters will appear in front or in the middle of each word. The input file may be empty, in this case the input will result in an empty set. There can be arbitrary number of Read commands at any position of the command file. If two Read commands provided same list name, that list will be overwritten by the last Read command (all previous contents will be lost).
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