function largestNumber(first, second, third) {
    if (first > second && first > third) {
        return first;
    } else if (second > first && second > third) {
        return second;
    } else {
        return third;
    }
}
const num1 = 100;
const num2 = 120;
const num3 = 80;
console.log(largestNumber(num1, num2, num3));
//Output: 120