ЯсноПонятно24

public class Calculator {

public static void main(String[] args) {
    double num1 = 10.5;
    double num2 = 5.5;

    System.out.println("Addition: " + add(num1, num2));
    System.out.println("Subtraction: " + subtract(num1, num2));
    System.out.println("Multiplication: " + multiply(num1, num2));
    System.out.println("Division: " + divide(num1, num2));
}

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("Error: Division by zero");
        return Double.NaN;
    }
}

}