ตัวดำเนินการเลขคณิตและสตริง

const a = 10;
const b = 3;

console.log(a + b);
console.log(a - b);
console.log(a * b);
console.log(a / b);
console.log(a % b);

const first = "Time";
const second = "stamp";
console.log(first + second);
console.log("คะแนน: " + 90);