Question 'bout loops.

[Jabberwiccy]

Hi. I've got a problem that I'm hoping somebody here can solve:
Is it possible to put a boolean inside of a loop? The program I'm writing needs an error check built in (i.e. it will only loop if the user inputs 'y' or 'Y', program ends if user inputs 'n', and asks for user to re-enter the character if it's anything else.) Any comments or help is greatly appreciated....


BTW, if I need to put the source code up, let me know!


Thanks millions,
Jabberwiccy

[r035198x]

Hi. I've got a problem that I'm hoping somebody here can solve:
Is it possible to put a boolean inside of a loop? The program I'm writing needs an error check built in (i.e. it will only loop if the user inputs 'y' or 'Y', program ends if user inputs 'n', and asks for user to re-enter the character if it's anything else.) Any comments or help is greatly appreciated....


BTW, if I need to put the source code up, let me know!


Thanks millions,
Jabberwiccy

Yeah let's have your code and show you were to do the touch ups

[Jabberwiccy]

Yeah let's have your code and show you were to do the touch ups

Alright, here it is...although it is a bit lengthy:

public class PowerBilling
{
    public static final double TAX = .035;
    public static final double RATE = .25;
 
    public static void main (String [] args)
    {
        int monthnum, year, read1, read2, diff, ec1;
        double charges, taxrate, total;
        String month = " ";
        String response = "y";
        char yesno;
        Scanner keyboard = new Scanner (System.in);
 
 
        DecimalFormat threePlaces = new DecimalFormat ("000");
        DecimalFormat fourPlaces = new DecimalFormat ("0000");
        DecimalFormat fivePlaces = new DecimalFormat ("000.00");
 
 
 
        do
            {
            //Data entry for the bill
            System.out.println ("Welcome to Power Billing\n\n");
            System.out.print ("Enter Year: ");
            year = keyboard.nextInt ();
            System.out.print ("Enter Month: ");
            monthnum = keyboard.nextInt ();
            System.out.print ("Electricty Readings \n\t Enter previous reading: ");
            read1 = keyboard.nextInt ();
            System.out.print ("\t Enter current reading: ");
            read2 = keyboard.nextInt ();
            System.out.println (" ");
 
            //calculations
            diff = read2 - read1;
            charges = diff * RATE;
            taxrate = charges * TAX;
            total = charges + taxrate;
 
                switch (monthnum)
                {
                    case 1:        month = ("January");
                                        break;
                    case 2:        month = ("Febuary");
                                        break;
                    case 3:        month = ("March");
                                        break;
                    case 4:        month = ("April");
                                        break;
                    case 5:        month = ("May");
                                        break;
                    case 6:        month = ("June");
                                        break;
                    case 7:        month = ("July");
                                        break;
                    case 8:        month = ("August");
                                        break;
                    case 9:        month = ("September");
                                        break;
                    case 10:    month = ("October");
                                        break;
                    case 11:    month = ("November");
                                        break;
                    case 12:    month = ("December");
                                        break;
                    default:    System.out.print ("Blargh");
                                        break;
                }
 
            //The bill itself
            System.out.println ("The Power Company");
            System.out.println ("Bill for " + month + ", " + year + "\n");
            System.out.println ("\t\t Previous   Current   Usage   Charges");
            System.out.println ("Electricity\t   " + (fourPlaces.format(read1))
                                + "\t     " + (fourPlaces.format(read2))//indented
                                + "      " + (threePlaces.format(diff)) //indented
                                + "     " + (fivePlaces.format(charges)));//indented
            System.out.println ("Tax\t\t\t\t\t       " + (fivePlaces.format(taxrate)));
            System.out.println ("\t\t\t\t\t      -------");
            System.out.println ("Total\t\t\t\t\t       " + (fivePlaces.format(total)));
            System.out.println ("\t\t\t\t\t      =======\n");
            System.out.println ("Thank you for saving our precious resources!");
            System.out.print ("Another bill?");
            response = keyboard.next();
            yesno = response.charAt (0);
            if (yesno == 'y')
                ec1 = 1;
            else if (yesno == 'n')
                ec1 = 0;
            else if (yesno == 'Y')
                ec1 = 1;
            else if (yesno == 'N')
                ec1 = 0;
            else
                ec1 = 3;
        }
        while (if ec1 == 1)
                else if (ec1 == 0)
                    System.out.print ("Reenter");
                else if (ec1 == 3)
                    System.out.print ("blargh");
    }
}
 

The stuff at the end is just me trying things out, and probably should be ignored...but still, any help is greatly appreciated.




Thanks,
Jabberwiccy

[r035198x]

 
 
import java.util.Scanner;
import java.text.*;
public class PowerBilling
{
 public static final double TAX = .035;
 public static final double RATE = .25;
 
 public static void main (String [] args)
 {
  int monthnum, year, read1, read2, diff, ec1;
  double charges, taxrate, total;
  String month = " ";
  String response = "";
  char yesno = 'y';
  Scanner keyboard = new Scanner (System.in);
 
 
  DecimalFormat threePlaces = new DecimalFormat ("000");
  DecimalFormat fourPlaces = new DecimalFormat ("0000");
  DecimalFormat fivePlaces = new DecimalFormat ("000.00");
 
 
 
  while( yesno == 'y' || yesno == 'Y')
   {
   //Data entry for the bill
   System.out.println ("Welcome to Power Billing\n\n");
   System.out.print ("Enter Year: ");
   year = keyboard.nextInt ();
   System.out.print ("Enter Month: ");
   monthnum = keyboard.nextInt ();
   System.out.print ("Electricty Readings \n\t Enter previous reading: ");
   read1 = keyboard.nextInt ();
   System.out.print ("\t Enter current reading: ");
   read2 = keyboard.nextInt ();
   System.out.println (" ");
 
   //calculations
   diff = read2 - read1;
   charges = diff * RATE;
   taxrate = charges * TAX;
   total = charges + taxrate;
 
    switch (monthnum)
    {
     case 1:  month = ("January");
          break;
     case 2:  month = ("Febuary");
          break;
     case 3:  month = ("March");
          break;
     case 4:  month = ("April");
          break;
     case 5:  month = ("May");
          break;
     case 6:  month = ("June");
          break;
     case 7:  month = ("July");
          break;
     case 8:  month = ("August");
          break;
     case 9:  month = ("September");
          break;
     case 10: month = ("October");
          break;
     case 11: month = ("November");
          break;
     case 12: month = ("December");
          break;
     default: System.out.print ("Blargh");
          //break;
    }
 
   //The bill itself
   System.out.println ("The Power Company");
   System.out.println ("Bill for " + month + ", " + year + "\n");
   System.out.println ("\t\t Previous   Current   Usage   Charges");
   System.out.println ("Electricity\t   " + (fourPlaces.format(read1))
        + "\t     " + (fourPlaces.format(read2))//indented
        + "      " + (threePlaces.format(diff)) //indented
        + "     " + (fivePlaces.format(charges)));//indented
   System.out.println ("Tax\t\t\t\t\t       " + (fivePlaces.format(taxrate)));
   System.out.println ("\t\t\t\t\t      -------");
   System.out.println ("Total\t\t\t\t\t       " + (fivePlaces.format(total)));
   System.out.println ("\t\t\t\t\t      =======\n");
   System.out.println ("Thank you for saving our precious resources!");
   System.out.print("Another bill? ");
 
   response = keyboard.next();
 
   yesno = response.charAt(0);
   System.out.print(yesno);
  }
 
 }
}
 
 

How about this?

[Jabberwiccy]

How about this?

Thank you. Is there a way to, if the answer is, say, 'q' or some other letter, inform the user that this is not an appropriate response and prompt them again? (If that makes any sense?)

[r035198x]

Thank you. Is there a way to, if the answer is, say, 'q' or some other letter, inform the user that this is not an appropriate response and prompt them again? (If that makes any sense?)

You'd add something like

 
yesno = response.charAt(0);
while(yesno != 'y' || yesno != 'Y' || yesno != 'N') {
     System.out.println("Invalid response. Please answer Y or N");
     response = keyboard.next();
     yesno = response.charAt(0); 
}