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\begin{document}

\title{CSC 1109 Lab 4}

\author{Woon Jun Wei, 2200624}

\date{\today}

\maketitle

\section*{Question 1}

\textbf{Method assignments}

I first instantiated 3 variables: `heightInInches`, `weightInPounds` and `bmi`.
The constructor takes in 2 parameters, `heightInInches` and `weightInPounds`
and assigns them to the corresponding variables.\\

The getters and setters are required to access the variables from outside the class,
which was required for the `main` method in BMI\_Main.java.\\
\\
\textbf{calBMI()}

The `calBMI` method takes in 2 parameters, `heightInInches` and `weightInPounds`.
Using these variables, I first converted the \textbf{height} from inches to meters,
using the formula `heightInMeters = heightInInches * 0.0254` where 0.0254 is given as the conversion ratio in the lab handout and
I converted the \textbf{weight} from pounds to kilograms, using the formula `weightInKilograms = weightInPounds * 0.45359237` where 0.45359237 is given as the conversion ratio in the lab handout.

I then calculated the \textbf{BMI} using the formula `bmi = weightInKilograms / (heightInMeters * heightInMeters)`.\\
\\
\textbf{BMIInterpretation()}

The `BMIInterpretation` method takes in 1 parameter, `bmi` and returns a string
based on the value of `bmi`.\\
The method checks against values in the table provided in the lab sheet and returns the corresponding string.\\

\pagebreak
\begin{lstlisting}[label={list:BMI},caption=BMI.java]
public class BMI {
    private double heightInInches;
    private double weightInPounds;
    private double bmi;

    public BMI(double heightInInches, double weightInPounds){
        this.heightInInches = heightInInches;
        this.weightInPounds = weightInPounds;
    }

    public double getHeightInInches() {
        return this.heightInInches;
    }

    public double getWeightInPounds() {
        return this.weightInPounds;
    }
    public void setHeightInInches(double heightInInches) {
        this.heightInInches = heightInInches;
    }

    public void setWeightInPounds(double weightInPounds) {
        this.weightInPounds = weightInPounds;
    }

    public double calBMI(double heightInInches, double weightInPounds){
        double heightInMeters = heightInInches * 0.0254;
        double weightInKilograms = weightInPounds * 0.45359237;
        this.bmi = weightInKilograms / (heightInMeters * heightInMeters);
        return this.bmi;
    }

    public void BMIInterpretation() {
        if (this.bmi < 18.5) {
            System.out.println("Underweight");
        } else if (this.bmi >= 18.5 && this.bmi < 25) {
            System.out.println("Normal");
        } else if (this.bmi >= 25 && this.bmi < 30) {
            System.out.println("Overweight");
        } else if (this.bmi >= 30) {
            System.out.println("Obese");
        }
    }
}
\end{lstlisting}
\pagebreak

\textbf{BMI\_Main.java}

The `BMI\_Main` class uses the `BMI` class to calculate the BMI of a person. This is
the main function that was used to access an use the `BMI` class.\\
Using a Scanner, I first got the hight and weight from the user,
I then created a new `BMI` object and passed the height and weight to the constructor.
I called the `calBMI` method and passed the height and weight to the method.\\

Lastly, the `BMIInterpretation` method was called to print the BMI interpretation.
The input and output variables from the first output corresponds with the output from the lab sheet\\

\begin{lstlisting}[label={list:BMI_Main},caption=BMI\_Main.java]
import java.util.Scanner;

public class BMI_Main {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);

        System.out.print("Enter your weight in pounds: ");
        double weightInPounds = s.nextFloat();

        System.out.print("Enter your height in inches: ");
        double heightInInches = s.nextFloat();

        BMI bmi = new BMI(heightInInches, weightInPounds);
        System.out.println("BMI is " + bmi.calBMI(bmi.getHeightInInches(), bmi.getWeightInPounds()));

        bmi.BMIInterpretation();
    }
}
\end{lstlisting}
\begin{lstlisting}[label={list:BMI_Output},caption=BMI\_Main.java Output]
//Output 1
Enter your weight in pounds: 146
Enter your height in inches: 70
BMI is 20.948603801493316
Normal

//Output 2
Enter your weight in pounds: 150
Enter your height in inches: 80
BMI is 16.478193272792794
Underweight
\end{lstlisting}

\pagebreak

\section*{Question 2}

\begin{lstlisting}[label={list:StackOfIntegers},caption=StackOfIntegers.java]

public class StackOfIntegers {
    private int[] elements;
    private int size;

    public StackOfIntegers(){
        this.elements = new int[16];
        this.size = -1;
    }
    public StackOfIntegers(int capacity){
        this.elements = new int[capacity];
        this.size = -1;
    }

    public boolean empty(){
        return size == -1;
    }
    public int peek(){
        return elements[size - 1];
    }

    public void push(int value){
        this.size++;
        this.elements[size] = value;
    }
    public int pop(){
        int value = elements[size];
        this.size--;
        return value;
    }
    public int getSize(){
        return size;
    }
}
\end{lstlisting}

\pagebreak

\begin{lstlisting}[label={list:TestStackOfIntegers},caption=TestStackOfIntegers.java]
public class TestStackOfIntegers {
    public static void main(String[] args) {
        StackOfIntegers stack = new StackOfIntegers();
        for (int i = 0; i < 10; i++) {
            stack.push(i);
        }
        while (!stack.empty()) {
            System.out.print(stack.pop() + " ");
        }
    }
}
\end{lstlisting}

\begin{lstlisting}[label={list:StackOfIntegers},caption=TestStackOfIntegers.java Output]
9 8 7 6 5 4 3 2 1 0
\end{lstlisting}

\end{document}