HomeWork Module 26

            
                
Через prompt:
            class Calculator {
                constructor() {
                    this.a = 0;
                    this.b = 0;
                }
                read() {
                    this.a = +prompt("Enter first number", 0);
                    this.b = +prompt("Enter second number", 0);
                }
                sum() {
                    return this.a + this.b;
                }
                mul() {
                    return this.a * this.b;
                }
                }

                const calculator = new Calculator();
                calculator.read();
                alert("Sum: " + calculator.sum());
                alert("Mul: " + calculator.mul());
                
Через input:
                const a = document.querySelector("#a");
                const b = document.querySelector("#b");

                const button_sum = document.querySelector("#sum");
                const button_mul = document.querySelector("#mul");

                class Calculator {
                constructor() {
                    this.a = 0;
                    this.b = 0;
                }
                
                read() {
                    this.a = +a.value;
                    this.b = +b.value;
                }
                
                sum() {
                    return this.a + this.b;
                }
                
                mul() {
                    return this.a * this.b;
                }
                }

                const calculator = new Calculator();

                button_sum.addEventListener("click", () => {
                calculator.read();
                document.querySelector(".result").textContent = "Sum: " + calculator.sum();
                });

                button_mul.addEventListener("click", () => {
                calculator.read();
                document.querySelector(".result").textContent = "Mul: " + calculator.mul();
                });