// This is not good practice

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.print("Enter number of shapes to calculate : ");

        int n = sc.nextInt();

        ArrayList<Double> areas = new ArrayList<>();

        for(int i = 0; i<n; i++) {

            System.out.print("Enter the shape type : \n1) Rectangle\n2) Square\n3) Circle\nInput : ");

            int select = sc.nextInt();

            double area;

            switch(select) {

                case 1:

                    Rectangle rect = new Rectangle();

                    rect.inputFromUser();

                    area = rect.getArea();

                    areas.add(area);

                break;

​

                case 2:

                    Square square = new Square();

                    square.inputFromUser();

                    area = square.getArea();

                    areas.add(area);

                break;

​

                case 3:

                    Circle circle = new Circle();

                    circle.inputFromUser();

// This is not good practice

const readline = require('readline').createInterface({

  input: process.stdin,

  output: process.stdout

})

​

console.log("Enter number of shapes to calculate : ")

readline.question(answer => {

  const n = parseInt(answer)

  const areas = []

​

  for(let i = 0; i<n; i++) {

    console.log("Enter the shape type : \n1) Rectangle\n2) Square\n3) Circle\nInput : ")

    readline.question(shape => {

      const select = parseInt(shape)

      switch(select) {

        case 1:

            let rect = new Rectangle();

            rect.inputFromUser();

            let area = rect.getArea();

            areas.push(area);

            break;

​

        case 2:

            let square = new Square();

            square.inputFromUser();

            area = square.getArea();