Q1. WAP to convert Dollar into Rupees and vice versa, Assume 1 dollar = 74.5 rupees. 1

//Convert Dollar into rupees and vice versa
import java.util.Scanner;

public class CurrencyConverter {
    public static void main(String[] args) {
        float d, r, rate=74.5f; //define 1 dollar rate
        int ch;
        Scanner sc = new Scanner(System.in);
        do{
            System.out.println("Enter 1 - Dollar to Rupees");
            System.out.println("Enter 2 - Rupees to Dollar");
            System.out.println("Enter 0 - Exit");
            ch = sc.nextInt();
            switch(ch)
            {
                case 0:
                    System.out.println("Thankyou for using this program");
                    //System.exit(0);  //for exit program
                    break;
                case 1:
                    System.out.println("Enter amount in Dollar");
                    d=sc.nextFloat();
                    r=d*rate;
                    System.out.println("Rupees = " + r);
                    break;
                case 2:
                    System.out.println("Enter amount in Rupees");
                    r=sc.nextFloat();
                    d=r/rate;
                    System.out.println("Dollar = " + d);
                    break;
                default:
                    System.out.println("Invalid Input");
            }
        }while(ch!=0);
    }
}