Question

1. Create an algorithm for a program that simulates a police radar gun. The algorithm should read an automobile speed (in km/h) and print the message “Speeding” if the speed exceeds 60kmh. The algorithm should then also calculate the appropriate fine. If the speed is 5 km/hr or less over this limit, only issue a warning. $80 for more than 5 and no more than 10 kmh above the limit, $150 for more than 10 but no more than 20kmh above the limit, $500 for more than 20kmh above the limit. You should give some thought as to the type of data you are working with before beginning to designed your solution.

2. (Design/Problem Solving exercise 2)

Read the notes at the end of this lab discussing how to create and apply test data. Use the test table template below and the test descriptions as hints to define suitable test data to test a program you will write.

Once you identify suitable inputs and have filled in this column then you should identify what outputs you expect. Also read the information at the end of this lab about selecting suitable test data.

Test #	Test Description	Inputs	Expected Outputs	Algorithm Outputs	Program Success/Failure
1	Not speeding but close.
2	Speeding but only just.
3	Speeding but still a warning.
4	$80 fine
5	Still an $80 but only just.
6	$150 fine.
7	Still a $150 fine but only just.
8	$500 fine.
9	Zero input
Test #	Test Description	Inputs	Expected Outputs	Algorithm Outputs	Program Success/Failure
10	Negative speed (this has no meaning).
11	Input of incorrect data type
12	Null input

Answer 1

Police Radar Gun Simulation Algorithm:

Step 1: Start

Step 2: Declare variables Speed, Fine

Step 3: Initialize variables Speed<-0, Fine<-0

Step 4: Print message “Please enter the Speed: “

Step 5: Read the input from the user

Step 6: If the input is not a number or nothing is entered

                           Print “Please enter the speed in numbers only”

                           Go to Step 4

Step 7: If Speed is negative or ‘0’

                           Print “Invalid Speed entered. Wrong Input”

                           Go to Step 9

Step 8: If Speed > 60 kmh

                           8.1        Print “Speeding”

                            8.2        If    Speed <= 65 kmh

                                                       Print “Issue Warning”

                                         Else    If Speed <= 70 kmh

                                                                     Fine <- $80

                                                       Else If Speed <= 80 kmh

                                                                                   Fine <- $150

                                                                     Else    Fine <- $200

                           8.3        Print   “Calculated fine is = Fine”

              Else Print “Not Speeding”                                                    

Step 9: Stop

=====================================================================================

Test cases are executed in the following way for the algorithm.

Test Description	Input	Expected Outputs	Algorithm Outputs	Program Success/Failure
Not Speeding but close	59 kmh	Not Speeding	Not Speeding	Success
Speeding but only just	61 kmh	Speeding Issue Warning Fine = 0	Speeding Issue Warning Fine = 0	Success
Speeding but still a warning	64 kmh	Speeding Issue Warning Fine = 0	Speeding Issue Warning Fine = 0	Success
$80 fine	67 kmh	Speeding Fine = $80	Speeding Fine = $80	Success
$150 fine	77 kmh	Speeding Fine = $150	Speeding Fine = $150	Success
Still a $150 fine but only just.	71 kmh	Speeding Fine = $150	Speeding Fine = $150	Success
$500 fine	90 kmh	Speeding Fine = $500	Speeding Fine = $500	Success
Zero Input	0 kmh	Invalid Speed entered. Wrong Input	Invalid Speed entered. Wrong Input	Success in handling invalid input.
Negative Speed	-30 kmh	Invalid Speed entered. Wrong Input	Invalid Speed entered. Wrong Input	Success in handling invalid input.
Input of incorrect data type	abce	Please enter the speed in numbers only	Please enter the speed in numbers only	Success in handling invalid input.
Null input		Please enter the speed in numbers only	Please enter the speed in numbers only	Success in handling invalid input.