CSCI120A

Introduction to Computer Science and Programming using Python

Fall 2008

This lab is not an assessed lab, i.e. it will not be marked.

You can ask for help at any time.

Complete as much as you can in class time,

then upload the file to the network folder:

CSCI on Pineapple\Anne Dawson\CSCI120A\Week03\LAB3B

by end of class today -

If you don't complete the assignment in class time,

try to complete it at home.

Lab Assignment 3B

Step 1

Study the following:

Note: you don't type in the code of your program until Step 3.

Payroll Calculations.

An employee is paid at a rate of $20.75 per hour for regular hours worked in a week. Regular hours are up to and including 40 hours per week. Any hours in a week worked over regular hours are paid at the overtime rate of time and a half (i.e. $20.75 x 1.5 per hour). The gross pay is calculated according to the number of hours worked in a week. Added to the gross pay for each employee each month is the sum of $54 which each single employee pays for their Medical Services Plan (MSP). If the employee is married, $36 is added to the gross pay for MSP instead of $54.

From the gross pay there are a number of deductions per month:

20% of gross pay is deducted for federal income tax (FIT).

5% of gross pay is deducted for Canada Pension Plan (CPP).

A lump sum of $75 is deducted for Extended Medical Insurance (EMI).

Your program should allow the user to enter the employee's name, their marital status (single or married) and the number of hours worked in each of the four weeks of the month. The number of hours can include a fractional part, e.g. 36.9. Your program calculates and displays the gross pay based on the total hours worked each week (rounded to the nearest integer, e.g. 36.9 is rounded to integer 37) and includes the MSP payment. The program calculates and displays the value of each of the deductions. Finally, the program displays the net salary (the take-home pay) for the employee which is calculated from gross pay minus deductions.

Step 2

Design an algorithm (the steps to solve the problem). You should have the algorithm approved by your instructor before going on to the next step.

The following web page will help you design your algorithm.

Algorithms.htm

Step 3

Using your algorithm as a guide, implement your program in the Python language. Use the IDLE GUI to edit and run your program:

Python_Editor_IDLE.htm

Your program should start with a comment block that contains the following information:

# File: yourstudentnumber.py

# Purpose: Lab3B - Payroll Calculations

# Programmer: your name

# Course: CSCI120A

# Date: Wednesday 24th September 2008

# Algorithm:

# Test data:

Please note: any lines in a Python program that start with the # symbol are known as comments. Comments are ignored when the program runs, but are useful when we read a program, because they supply information about the program. They are always used at the top of a program to supply information about the purpose of a program, its file name, the programmer etc, as shown above. They are also used in the body of a program to explain parts of the program which may be hard to understand. Example programs in this course will demonstrate the correct use of comments. You are expected to supply the above set of comments (updated appropriately) for all of your lab and homework programming assignments.

Step 4

Test your program by running supplying your own test data. You should test your program with at least 3 sets of test data. Show your test data and results in comments at the top of your program.

Step 5

Before the end of the class, follow these instructions to copy your program file (yourstudentnumber.py) - (just your Python file - no folders please), to :

CSCI on Pineapple\Anne Dawson\CSCI120A\Week03\LAB3B

The following marking scheme is just a guide to illustrate how this program would be marked if it was an assessed lab. Note that 65% of the points are awarded for design and style. Only 35% of the marks are awarded for a complete and tested program!

Marking Scheme: CSCI120A - Lab 3B - Payroll Calculations

Marking Scheme

Category	Points	Description
Comments	10	The program should be commented as specified in this document.
algorithm	30	An informal description of the steps that must be taken to solve the problem. The algorithm should be included in comments in your source code file (studentnumber.py).
Output	10	Screen prompts and results should be user-friendly.
Correctness	10	The program should do what is required.
Completeness	10	The program should be complete.
Style	15	The source code should use meaningful variable names.
Test	15	Comments in the code explain how the code was tested.