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import java.util.Scanner; public class Temperature{ public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("Choose an option:"); System.out.println("1. Convert Celsius to Fahrenheit"); System.out.println("2. Convert Fahrenheit to Celsius"); int choice = scanner.nextInt(); switch (choice) { case 1: convertCelsiusToFahrenheit(scanner); break; case 2: convertFahrenheitToCelsius(scanner); break; default: System.out.println("Invalid choice. Please choose 1 or 2."); } } private static void convertCelsiusToFahrenheit(Scanner scanner) { System.out.print("Enter temperature in Celsius: "); double celsius = scanner.nextDouble(); double fahrenheit = (celsius * 9 / 5) + 32; System.out.println(celsius + " Celsius is equal to " + fahrenheit + " Fahrenheit."); } private static void convertFahrenheitToCelsius(Scanner scanner) { System.out.print("Enter temperature in Fahrenheit: "); double fahrenheit = scanner.nextDouble(); double celsius = (fahrenheit - 32) * 5 / 9; System.out.println(fahrenheit + " Fahrenheit is equal to " + celsius + " Celsius."); } } 2.import java.lang.Math; class DistanceCalculator { private double x1, y1, x2, y2; public DistanceCalculator(double x1, double y1, double x2, double y2) { this.x1 = x1; this.y1 = y1; this.x2 = x2; this.y2 = y2; } public double calculateDistance() { double distanceCal = Math.sqrt(Math.pow((x2 - x1), 2) + Math.pow((y2 - y1), 2)); return distanceCal; } public static void main(String[] args) { double x1 = 1.0, y1 = 2.0, x2 = 4.0, y2 = 5.0; DistanceCalculator distanceCalculator = new DistanceCalculator(x1, y1, x2, y2); double distance = distanceCalculator.calculateDistance(); System.out.println("Distance between points: " + distance); } } 3.public class Calculator { public static double add(double num1, double num2) { return num1 + num2; } public static double subtract(double num1, double num2) { return num1 - num2; } public static double multiply(double num1, double num2) { return num1 * num2; } public static double divide(double num1, double num2) { if (num2 != 0) { return num1 / num2; } else { System.out.println("Division by zero is not allowed"); return Double.NaN; } } public static void main(String[] args) { double operand1 = 10; double operand2 = 5; System.out.println("Addition: " + add(operand1, operand2)); System.out.println("Subtraction: " + subtract(operand1, operand2)); System.out.println("Multiplication: " + multiply(operand1, operand2)); System.out.println("Division: " + divide(operand1, operand2)); } } 4.import java.util.Scanner; class Circle { private double radius; public Circle(double radius) { this.radius = radius; } public double calculateArea() { return Math.PI *Math.pow(radius,2); } } public class AreaCircle{ public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter the radius of the circle: "); double radius = scanner.nextDouble(); Circle circle = new Circle(radius); System.out.println("Area of the circle: " + circle.calculateArea()); } } 5.
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