Question

Write a program that allows a user to enter a number of values, the program should then convert the values entered in pounds (GBP) into a number of different currencies. The menu should look something like this:

1. Enter values and type -1 to stop
2. Euros
3. Dollars
4. Yen
5. Rupees
6. Exit

When 2, 3, 4 or 5 are selected the program should display each value entered in both the original pounds and the converted currency, along with a total of all numbers and converted total.

public class Money {
    public static void main(String[] args) {
        System.out.println("Enter values and type -1 to stop"); 
        System.out.println("'1' = Euros"); 
        System.out.println("'2' = Dollars"); 
        System.out.println("'3' = Yen"); 
        System.out.println("'4' = Rupees"); 
        System.out.println("'5' = Exit"); 

        int count=0;
        String exit = "-1", euro="E";

        Scanner scan = new Scanner(System.in);

        System.out.println();
        System.out.print("Convert to: ");

        while (!scan.hasNext("[E, D, Y, R, X]+")) {
            System.out.print("Invalid value, enter Surname again: ");
            scan.next();
        }

        String exTo = scan.next();

        ArrayList<String> num = new ArrayList<String>();

        while (true) {
            count++;
            System.out.print("|| Enter values "+count+" in (P)Pounds : ");

            while (!scan.hasNextDouble()) {
                System.out.print("Invalid value, try again: ");
                scan.next();
            }
            num.add(scan.next());

            if(num.contains(exit)){
                String ar[]=num.toArray(new String[num.size()]);
                ar=num.toArray(ar);

                System.out.println("Result: "+ num);

                scan.close();
                break;
            }
        }
    }
}

Answer 1

try this :

import java.util.*;
class Money {
    public static void main(String[] args) {
        System.out.println("Enter values and type -1 to stop"); 
        System.out.println("'1' = Euros"); 
        System.out.println("'2' = Dollars"); 
        System.out.println("'3' = Yen"); 
        System.out.println("'4' = Rupees"); 
        System.out.println("'5' = Exit"); 
    int count=0;
    String exit = "-1", euro="E";

    Scanner scan = new Scanner(System.in);

    System.out.println();
    System.out.print("Convert to: ");

    while (!scan.hasNext("[E, D, Y, R, X]+")) {
        System.out.print("Invalid value, enter Surname again: ");
        scan.next();
    }

    String exTo = scan.next();

    ArrayList<String> num = new ArrayList<String>();

    while (true) {
        count++;
        System.out.print("|| Enter values "+count+" in (P)Pounds : ");

        while (!scan.hasNextDouble()) {
            System.out.print("Invalid value, try again: ");
            scan.next();
        }
        num.add(scan.next());

        if(num.contains(exit)){
            for(int i=0;i<num.size();i++){
            num.set(i,Integer.toString((Integer.parseInt(num.get(i))*2)));
            }
            System.out.println("Result: "+ num);

            scan.close();
            break;
        }
    }
}
}

to remove the last input (-1)

add this line before print num.remove("-1");