CPSC 231: Assignment 6 (Worth 5%)

For this assignment you are to write a simple calculator.  The program will prompt the user to enter mathematical expression and program will display the original expression as well as the result.  It will then prompt the person if they wish to run the program again.  The expression will be entered in the following format:

    <First operand> <Operation> <Second operand>

• Operands will consist of a one or two digit number.
• Operations will consist of: addition (+), subtraction (-), multiplication (*) or integer division (/).
• There is no spaces in the expression.

Pascal functions and procedures that you can use:

For this assignment cannot use any pre-created functions or procedures that convert character arrays to integers.  You can however use the 'ord' function to determine the ASCII value for a given character.

Grading

(Bare bones) basic assignment (worth 5 marks)

• Declares a one-dimensional character array to store the expression
• Displays an introduction
• Prompts the user to enter a mathematical expression
• Reads the expression into the array
• Displays the expression onscreen
• Loops back to third step until the person quits the program
• Displays a sign off exit message

One mark will be lost for each of the above features that are missing down to a minimum grade of 3 (assuming that the program compiles).

Extra features:

Once you complete all the features of the basic assignment you can complete the extra features for additional credit (make sure you backup your work first!)   Unless there are technical considerations you can complete these extra features in whatever order or combination that you desire.  (For example: Your program can't perform a mathematical until it can extract the necessary information from the array).

Submission requirements

In addition to having fulfill the generic assignment requirements, the requirements specific to this assignment include:

1. Include a README file in your submission:  For this assignment your README file must include your contact information: your name, university identification number and UNIX login name so that your marker knows whose assignment that he or she is marking.   For this assignment you should also list the features that you implemented.

2. Assignments (source code/'dot-p' file and the README file) must be electronically submitted.  In addition a paper print out of the source code and README must be handed into the assignment drop box (located on the second floor of the Math Sciences building) for the tutorial that you are registered in.  Electronically submitting the assignment allows your marker to run the code in order to quickly determine what features were implemented.  Providing a paper printout makes it easier for your marker to read and flip through your source code.  Unless you are told otherwise you are to email your source code and readme file to your TA and to me.  Make sure that include the following information in the subject line: "CPSC 231 Assignment X" where 'X' stands for the assignment number that you are submitting e.g., "CPSC 231 Assignment 3".

3. As a reminder, you are not allowed to work in groups for this class.   Copying the work of another student will be regarded as academic misconduct (cheating).  For additional details about what is and is not okay for this class please refer to the following link.

To help make sure that you haven't missed anything here is a checklist of items to be used in marking.  A sample executable 'calculator' can be found in UNIX under the directory: /home/231/tamj/assignments/assignment6.