4.5

package KursovaRabotaSrok2;
public class Calculator {
    private double num1;
    private double num2;
    public double sum() {
        return num1 + num2;
    }
    public double subtraction() {
        return num1 - num2;
    }
    public double multiply() {
        return num1 * num2;
    }
    public double divide() {
        return num1 / num2;
    }
}