DAY 1

1) 

    public static void printMessage(String message) {
        System.out.println(message);
    }

2)

    public static void calculateArea(double length, double width) {
        double area = length * width;
        System.out.println("The area of the rectangle is: " + area);
    }

3)

    public static void calcAverage() {
        Scanner scanner = new Scanner(System.in);
    
        System.out.print("Input the first number: ");
        double num1 = scanner.nextDouble();
    
        System.out.print("Input the second number: ");
        double num2 = scanner.nextDouble();
    
        System.out.print("Input the third number: ");
        double num3 = scanner.nextDouble();
    
        double average = (num1 + num2 + num3) / 3;
    
        System.out.printf("The average value is %.1f\n", average);
    
        scanner.close();
    }

4)

    public static void printPattern(int n) {
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }

5)

    import java.util.Scanner;
    public class PrintMethods {
        public static void main(String [] args) {
            Scanner scanner = new Scanner(System.in);
    
            System.out.println("Enter the day of the week:");
            String day = scanner.next();
    
            System.out.println("Enter the date:");
            int date = scanner.nextInt();
    
            System.out.println("Enter the month (January to December):");
            String month = scanner.next();
    
            System.out.println("Enter the year:");
            int year = scanner.nextInt();
    
            printAmerican(day, date, month, year);
            printEuropean(day, date, month, year);
    
            scanner.close();
        }
    
        public static void printAmerican(String day, int date, String month, int year) {
            System.out.println(day + ", " + month + " " + date + ", " + year);
        }
    
        public static void printEuropean(String day, int date, String month, int year) {
            System.out.println(day + " " + date + " " + month + " " + year);
        }
    }

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DAY 2

1) 

    // Method to find the largest of three integers
    public static int biggest(int a, int b, int c) {
        int largest = a; // assume 'a' is the largest to start
    
        if (b > largest) {
            largest = b;
        }
        if (c > largest) {
            largest = c;
        }
    
        return largest; // return the largest value
    }

OR 

    public static int biggest(int a, int b, int c) {
        return Math.max(a, Math.max(b, c));
    }

2)

    // Method to calculate the perimeter of a triangle
    public static double calcPerimeter(double a, double b, double c) {
        return a + b + c;
    }
    
    // Method to calculate the perimeter of a square
    public static double calcPerimeter(double length) {
        return 4 * length;
    }
    
    // Method to calculate the perimeter of a rectangle
    public static double calcPerimeter(double length, double width) {
        return 2 * (length + width);
    }

3) 

1  8  8
-48  8  8

4) 

a. public static int method(int b, int a)

b. c = method(a, b); AND a = method(b, a);

c. 

    public static int method(int b, int a) {
        int d;
    
        d = a * b - b * b;
        return d + b;
    }

5) 

    import java.util.Scanner;//Scanner
    public class CountOccurrences {
        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            System.out.print("Enter a String: ");
            String temp = sc.nextLine().toLowerCase();
            int count = 0;
            for(char c='a'; c<='z'; c++) {// iterate for each lower case letter
                count = countOccurrences(temp, c);// count number of times lower case letter appears
                if(count>0) System.out.println(c + " appears " + count + " times");// if it appears, output how many times
            }
        }
    
        // iterate through the String and compare each lowercase version of the letter at that index to c, returning the count
        public static int countOccurrences(String temp, char c) {
            int count = 0;
            for(int i=0; i<temp.length(); i++) {
                if(c==temp.charAt(i)) count++;
            }
            return count;
        }
    }

6)

    public static boolean isDivisible(double n, double m) {
        return (n % m == 0);
    }

7) 

    /**
     * Checks if the given three sides form a valid triangle.
     * @param side1 the length of the first side of the triangle
     * @param side2 the length of the second side of the triangle
     * @param side3 the length of the third side of the triangle
     * @return true if the sides can form a valid triangle, false otherwise 
     */
    public static boolean isTriangle(int side1, int side2, int side3) {
        boolean isPositive = (side1 > 0) && (side2 > 0) && (side3 > 0);
        return (isPositive && (side1 + side2 > side3) && (side1 + side3 > side2) && (side2 + side3 > side1));
    }

8) 

true
true
ping!
pong!

9) 

    public static double calculateVolumeOfSphere(double radius) {
        return (4.0/3.0) * Math.PI * Math.pow(radius, 3);
    }
    
    public static double calculateSurfaceAreaOfSphere(double radius) {
        return 4 * Math.PI * Math.pow(radius, 2);
    }
    
    public static boolean isSphereLarge(double radius) {
        return calculateVolumeOfSphere(radius) > 1000;
    }
    
    public static void main(String [] args) {
        double radius = 5.0;
        double volume = calculateVolumeOfSphere(radius);
        double surfaceArea = calculateSurfaceAreaOfSphere(radius);
        boolean isLarge = isSphereLarge(radius);
    
        System.out.println("Volume of the sphere: " + volume + " cubic units");
        System.out.println("Surface area of the sphere: " + surfaceArea + " square units");
        System.out.println("Is the sphere large: " + isLarge);
    }

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LAB 4 TO BE DISCUSSED IN CLASS

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