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Thread: How can I make a loop repeat?

  1. #1
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    Default How can I make a loop repeat?

     
    import javax.swing.JOptionPane;
    public class program7 {
     
        public static void main(String[] args) {
     
    //ask user how many euros a dollar buys
    String euroExchangeRateString = JOptionPane.showInputDialog
            (null, "Enter how many Euros one Dollar will buy");
    double euroExchangeRate = Double.parseDouble(euroExchangeRateString);
     
    //ask user how many pounds a dollar will buy
    String poundExchangeRateString = JOptionPane.showInputDialog
            (null, "Enter how many Pounds one Dollar will buy");
    double poundExchangeRate =  Double.parseDouble(poundExchangeRateString);
     
    //ask user how many yen a dollar will buy
    String yenExchangeRateString = JOptionPane.showInputDialog
            (null, "Enter how many Yen one Dollar will buy");
    double yenExchangeRate = Double.parseDouble(yenExchangeRateString);
     
    //ask user to enter the number of dollars they have
     
        String amountDollarsString = JOptionPane.showInputDialog
    (null, "Enter the amount of foreign currency you want to buy in U.S. dollars");
    double amountDollars = Double.parseDouble(amountDollarsString);
    if (amountDollars <= 100){
    amountDollars -= amountDollars * 0.10;
    JOptionPane.showMessageDialog
            (null,"You can buy $" + amountDollars + " in foreign currency.");
    }
    else if (amountDollars > 100) {
    amountDollars -= amountDollars * 0.05;
    JOptionPane.showMessageDialog
            (null,"You can buy $" + amountDollars + " in foreign currency.");
        }
     
     
    String reply = JOptionPane.showInputDialog 
        (null, "Enter 'E' to buy Euros, 'P' to buy Punds or 'Y' to buy Yen");
    char firstChar = reply.charAt(0);
     
    while (firstChar == 'E' || firstChar == 'e'){
    double amountEuros = (amountDollars * euroExchangeRate);
    JOptionPane.showMessageDialog
            (null, "You have purchased " + amountEuros + " Euros.");
    }
    if (firstChar == 'P' || firstChar == 'p') {
    double amountPounds = (amountDollars * poundExchangeRate);
    JOptionPane.showMessageDialog
            (null, "You have purchased " + amountPounds + " Pounds.");
    }
    else if (firstChar == 'Y' || firstChar == 'y') {
    double amountYen = (amountDollars * yenExchangeRate);
    JOptionPane.showMessageDialog
            (null, "You have purchased " + amountYen + " Yen.");
    }
    JOptionPane.showConfirmDialog
            (null, "Are there any more conversions you would like to perform?");
            }
        }

    On the last part, the program is supposed to ask the user if there are anymore conversions to perform. I put in a confirm dialog box, but when the user clicks yes it does not go back to repeat the previous loop. How can I make it do that?


  2. #2
    Super Moderator curmudgeon's Avatar
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    Default Re: How can I make a loop repeat?

    One way to make things repeat is to ask the same question several times, but we ask that you not do this. Closed as duplicate.

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