COIT20245
Assignment 1
Assessment Task
You are to write a Java console application that calculates and classifies BMI (Body Mass Index) for individuals. The number of individuals (N) is fixed at 10, so it should be declared as final int N = 10 in your program.
BMI is calculated using the following equation:
BMI = weight / (height*height) where weight is in kilograms and height is in metres.
Wikipedia (https://en.wikipedia.org/wiki/Body_mass_index) defines the following 8 categories for BMI:
Category BMI (kg/m2)
Very severely underweight Severely underweight from
15 to
15
16
Underweight 16 18.5
Normal (healthy weight) 18.5 25
Overweight 25 30
Obese Class I (Moderately obese) 30 35
Obese Class II (Severely obese) 35 40
Obese Class III (Very severely obese) 40
For each person, you are to enter their weight (in kilograms) and height (in metres).The application is to then calculate and display the BMI, together with the corresponding 8 level category. When all data has been entered, a summary report consisting of
1. The lowest BMI
2. The highest BMI
3. The average BMI
4. The number of individuals with normal BMI
5. The number of individuals with higher than normal BMI 6. The number of individuals with lower than normal BMI is displayed.
Normal, low and high BMI values are defined according to the table below:
Category BMI (kg/m2) from to Low 18.5
Normal (healthy weight) 18.5 25
High 25
Below is example output for N = 3
Your welcome message goes here …
Height for person 1 (m): 1.82
Weight for person 1 (kgs): 80
BMI for person 1: 24.2 which is normal (healthy weight) Height for person 2 (m): 1.82
Weight for person 2 (kgs): 100
BMI for person 2: 30.2 which is moderately obese
Height for person 3 (m): 1.82
Weight for person 3 (kgs): 60
BMI for person 3: 18.1 which is underweight
Summary
*******
Lowest BMI : 18.1
Highest BMI : 30.2
Average BMI : 24.2
Number with low BMI: 1
Number with normal BMI: 1
Number with high BMI: 1
Your exit message goes here …
Your application is to follow the same format for input and output as in the example above, but with customised welcome and exit messages.
The application is to use the following classes and methods:
public class BMICalculator {
public BMICalculator() {
// no code required
}
public double value( double weight, double height ) { // return BMI;
}
public String classification8( double bmi ) {
// return the 8 category (Wikipedia) classification for this BMI
}
public String classification3( double bmi ) {
// return the 3 category (high, normal, low) classification for this BMI
}
}
public class Assignment1 {
// no attributes required
public static void main(String[] args) { // local variable declarations go here
// display welcome message
// loop to input an individual’s height and weight and calculate and display BMI, calculate summary values
// generate and display summary
// display exit message
} }
Submission
You are to submit a zipped folder containing
• The two .java files that comprise your application. Alternatively, if you have used NetBeans, this can be replaced with a zipped project folder. Details of how to do this are available in the NetBeans FAQ on the unit website.
• Report.docx. This file contains a test report that includes student name, student ID number, unit name, unit code, a test plan and test results. The test plan is to contain a list of the input values that you have used to test the program, the expected output values and the actual output values generated by your program. The test results are screenshots to show that that the program generates the actual outputs shown in the test plan.
Note that because BMI is calculated as a floating point value, we can’t (in general) test it for equality. What this means in terms of your test plan is that you do not need to test the category end points – all you need to do is to generate one set of inputs (and the corresponding output) per category. In generating these inputs, you may find a BMI calculator, such as https://www.heartfoundation.org.au/your-heart/know-your-risks/healthy-weight/bmi-calculator useful. Note that markers will use their own test data when testing your assignment.
Marking Criteria
Criteria
Marks
Allocated
1 Variables, constants and types
Declaring and using variables and constants /1
2 Objects and classes
Creating/declaring and using objects and classes /1
3 Loops
Using loops and conditions /1
4 If statements
Using if statements and conditions /1
5 Methods
Declaring and using methods /1
6 Inputs and Outputs
Reading input /1
Displaying results /1
7 Overall logic and program
Calculating quantities /4
Spacing and indentation conventions /1
Naming conventions /1
Comments /2
8 Report
Test Plan /2
Test results /3
Sub-Total /20
Penalties
Does not compile: 15 marks
Late submission : 5% (1 mark) / day or part of a day
Total /20