用Stack代写一个postfix expression evaluator，将数字压入stack，读到expression时弹出即可，属于比较常规的作业。
Requirement
In this homework, you will create and turn in your second program on BGUnix. Please see the documentation below for instructions on obtaining and configuring a BGUnix account.
Once you have an account, SSH in and join the class by issuing the command:
$ class -join cs3350
This should create a directory in your home directory named ‘cs3350’. All your work this semester must occur inside this directory (do not create a subdirectory unless the homework specifically requests one). Any required files will be automatically collected from this directory at the due date/time for the assignment!
Program Details
In this program, you will implement a postfix expression evaluator. See the book and slides for the concrete algorithm you need to implement. You must use stacks (I provide LinkedStack.h/LinkedStack.cpp/StackInterface.h/Node.h/Node.cpp files in the class lib folder!).
You must provide a hw3.cpp driver file that contains the implementation of the algorithm and a main method that instantiates runs the algorithm. The driver program should:
- Loops, asking the user to provide either a number (can be more than 1 digit!) or an operator (+ - / *)
- Stops the loop when -1 is entered (do not add -1 to the expression!)
- Evaluates the given postfix expression
- Displays the final result of evaluating the postfix expression (on a line by itself - this should be the last line displayed by your program!)
Documentation
Your code should include proper documentation/comments where appropriate. A portion of the grade is attributed directly to documentation (see the grading rubric provided on Canvas).
Functions should be proceeded by a comment block documenting the function’s purpose.
Blocks of code should contain comments describing what that block is contributing to the overall solution.
What to Turn In
The automated turn-in collection script will save these files from your class directory:
- hw3.cpp
The script will assume the following command line to compile your homework (your code must work with this exact command line!):
$ g++ -std=c++11 -Ilib hw3.cpp
This assumes that LinkedStack.*/StackInterface.h/Node.* are in the lib/ directory.