Untitled

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));
    }
}