Member Avatar for mikev9359

I am trying to change a program from an IF loop to a WHILE loop. The program started in Ch.05. It was modified in Ch.06 to an IF loop & now must be changed to a WHILE.
I got it down to 2 errors and am totally lost. Maybe a fresh set of eyes can point me in the right direction?
I've attached all 3 so you may see the progression.
Any assistance is greatly appreciated.

//Inputs are	: Account #, Customer name, old and new meter reading
//Outputs	: Company name (although there is no indications of a business input), 
//		Account #, Customer name, old & new meter readings, kwh used and Amount due

import javax.swing.*;
import java.text.*;// enables DecimalFormat.
public class Ch.05
{
   public static void main (String args[]) 
   {
    double newUsage, amtDue, over1, over2;
    String oldMtrStr, newUsageStr, cnameStr, newMtrStr;
    	cnameStr = JOptionPane.showInputDialog(null, "Enter Customer Name");
//	bnameStr = JOptionPane.showInputDialog(null, "Enter Business Name"); if & when applicable this can be activated
	String oldMtrString = JOptionPane.showInputDialog(null, "Enter Old Meter Reading");
	String newMtrString = JOptionPane.showInputDialog(null, "Enter New Meter Reading");
	String acctString = JOptionPane.showInputDialog(null, "Enter Account Number");
	Double oldMtr = Double.valueOf(oldMtrString); 
	Double newMtr = Double.valueOf(newMtrString);
	Double acct = Double.valueOf(acctString);
	newUsage = (newMtr - oldMtr); // This calculates NEW usage by subtracting your old meter reading from your new reading
	DecimalFormat Due = new DecimalFormat("$,###.00");	//This formats the Amount Due to 2 decimal places 

// Here is where the calculations begin

if (newUsage < 301)		// If your new meter reading is LESS THAN 301 you are charged a flat rate of $5.00 
	{amtDue=5.00;}
    else
       if(newUsage < 1001)		// If you used more than 300 & less than 1000, 300 is subtracted from the New reading
	{over1 = newUsage - 300;	// The difference is taken and...
         amtDue=(over1 * .03) + 5.00;}	//then multiplied by 3 cents. This figure is added to the 5.00 for the total due
    	  else 				//If you used over 1000 Kwh						
	  {over2 = newUsage - 1000;	  // The difference is taken and it's    
	  amtDue = (over2 * 0.02) + 35.00;}//then multiplied by 2 cents. $35.00 then added for your total due

JOptionPane.showMessageDialog(null,"Company Name (if applicable)" +		//This confirms the Business (if applicable)

//This can replace the previous line if we decide to enter business names:(null,"Company Name " + bnameStr+

				"\nYour Account number is " + acctString + 	// This confirms your Previous Acct # Input
				"\nCustomer Name is " + cnameStr +		//This confirms your Name
				"\nNew Meter Reading is " + newMtrString +	//This confirms your NEW METER Reading
				"\nOld Meter Reading was" + oldMtrString +	//This confirms your Old Meter Reading
				"\nKwh Used is: " + newUsage +			//This shows your Billable Usage of Kwhs
				"\nThe TOTAL Amount Due is " + Due.format(amtDue));// This shows how much is due
    			System.exit(0);									
	} 
}
import javax.swing.*;
import java.text.*;// enables DecimalFormat.
public class Electric61
{
   public static void main (String args[]) 
   {
    double newUsage, amtDue, over1, over2; //Over1 is for KWH >300 but <1001 and Over2 is for KWH>1000
	int again;    
	   String oldMtrStr, newUsageStr, cnameStr, newMtrStr;
   do
    {
    	cnameStr = JOptionPane.showInputDialog(null, "Enter Customer Name");
//	bnameStr = JOptionPane.showInputDialog(null, "Enter Business Name"); if & when applicable this can be activated
	
	String oldMtrString = JOptionPane.showInputDialog(null, "Enter Old Meter Reading");
	String newMtrString = JOptionPane.showInputDialog(null, "Enter New Meter Reading");
	String acctString = JOptionPane.showInputDialog(null, "Enter Account Number");
	Double oldMtr = Double.valueOf(oldMtrString);// Old Meter Reading
	Double newMtr = Double.valueOf(newMtrString);// New Meter Reading
	Double acct = Double.valueOf(acctString); //Account Number
	
	   newUsage = (newMtr - oldMtr); // This calculates NEW Usage by subtracting your old meter reading from your new reading
	   DecimalFormat Due = new DecimalFormat("$,###.00");	//This formats the Amount Due to 2 decimal places 

// Here is where the calculations begin

 if(newUsage < 301) // If new meter reading less old meter reading > 301 you're charged a flat rate of $5.00 
	{amtDue=5.00;}
    else
       if(newUsage < 1001)		// If you used more than 300 & less than 1000, 300 is subtracted from the New reading
	{over1 = newUsage - 300;	// The difference is taken and...
         amtDue=(over1 * .03) + 5.00;}	//then multiplied by 3 cents. This figure is added to the 5.00 for the total due
    	  else 				//If you used over 1000 Kwh						
	  {over2 = newUsage - 1000;	  // The difference is taken and it's    
	  amtDue = (over2 * 0.02) + 35.00;}//then multiplied by 2 cents. $35.00 then added for your total due

JOptionPane.showMessageDialog(null,"Company Name (if applicable)" + //This confirms the Business (if applicable)

//This can replace the previous line if we decide to enter business names:(null,"Company Name " + bnameStr+

				"\nYour Account number is " + acctString + 	// This confirms your Previous Acct # Input
				"\nCustomer Name is " + cnameStr +		//This confirms your Name
				"\nNew Meter Reading is " + newMtrString +	//This confirms your NEW METER Reading
				"\nOld Meter Reading was" + oldMtrString +	//This confirms your Old Meter Reading
				"\nKwh Used is: " + newUsage +			//This shows your Billable Usage of Kwhs
				"\nThe TOTAL Amount Due is " + Due.format(amtDue));// This shows how much is due
    			
	again = JOptionPane.showConfirmDialog(null,"Any Customer to Enter? ");
}

while(again == JOptionPane.YES_OPTION);  
//displays the dialog box to put YES/NO 

	
System.exit(0);
}
}
import javax.swing.*;
import java.text.*;// enables DecimalFormat.
public class Lab07
{
   public static void main (String args[]) 
   {
    double newUsage, amtDue, over1, over2; // Over1 is for KWH >300 but <1001 and Over2 is for KWH>1000
	int again;    
	   String oldMtrStr, newUsageStr, cnameStr, newMtrStr;
   do
    {
    	cnameStr = JOptionPane.showInputDialog(null, "Enter Customer Name");
//	bnameStr = JOptionPane.showInputDialog(null, "Enter Business Name"); if & when applicable this can be activated
	
	String oldMtrString = JOptionPane.showInputDialog(null, "Enter Old Meter Reading");
	String newMtrString = JOptionPane.showInputDialog(null, "Enter New Meter Reading");
	String acctString = JOptionPane.showInputDialog(null, "Enter Account Number");
	Double oldMtr = Double.valueOf(oldMtrString);// Old Meter Reading
	Double newMtr = Double.valueOf(newMtrString);// New Meter Reading
	Double acct = Double.valueOf(acctString); //Account Number
	
	   newUsage = (newMtr - oldMtr); // This calculates NEW Usage by subtracting your old meter reading from your new reading
	   DecimalFormat Due = new DecimalFormat("$,###.00");	//This formats the Amount Due to 2 decimal places 

// Here is where the calculations begin

System.out.print( "Enter Customer Name or Stop to quit: " );// prompt
 cname = input.nextLine(); // read employees name
	// loop until sentinel value read from user 
while ( cname != "Stop" )
{
if(newUsage < 301) 			// If new meter reading less old meter reading > 301 you're charged a flat rate of $5.00 
	{amtDue=5.00;}
    else
       if(newUsage < 1001)		// If you used more than 300 & less than 1000, 300 is subtracted from the New reading
	{over1 = newUsage - 300;	// The difference is taken and...
         amtDue=(over1 * .03) + 5.00;}	//then multiplied by 3 cents. This figure is added to the 5.00 for the total due
    	  else 				//If you used over 1000 Kwh						
	  {over2 = newUsage - 1000;	  	// The difference is taken and it's
	  amtDue = (over2 * 0.02) + 35.00;}	//then multiplied by 2 cents. $35.00 then added for your total due
System.out.print("Customer Name " + //This confirms the Customer Name)
//Can be added if we use Business"\nBusiness Name is " + bnameStr +	   //This confirms your Name
		"\nYour Account number is " + acctString + // This confirms your Previous Acct # Input
		"\nNew Meter Reading is " + newMtrString + //This confirms your NEW METER Reading
		"\nOld Meter Reading was" + oldMtrString + //This confirms your Old Meter Reading
		"\nKwh Used is: " + newUsage +		   //This shows your Billable Usage of Kwhs
		"\nThe TOTAL Amount Due is " + Due.format(amtDue));// This shows how much is due
//from IF program in Ch.06 again = System.out.print("Any Customer to Enter? ");replaced by 1st line of calculations
}
System.exit(0);
}	// Lab07.java:51: while expected

}	// Lab07.java:52: illegal start of expression
}
  • 4 Contributors
  • 6 Replies
  • 173 Views
  • 2 Years Discussion Span
  • Latest Post Latest Post by jon.kiparsky
Member Avatar for Ezzaral

You are pretty close. The errors are because you still have mismatched braces on the loop blocks. You left the do() statement in, which is messing up your while() block. Walk through the flow of that while() block and you'll see that you need to prompt for another customer name at the end of it so the sentinel while() test can evaluate whether you want to continue or stop.

Member Avatar for mikev9359

It's amazing what a fresh set of eyes can see.
I will be attempting it again tomorrow with the info you provided.
Thanks for your assist. Hopefully I'll be refeshed and 'clear-minded' to attempt this tomorrow.

Member Avatar for bobbyfischer

Somebody save me i need someone to tell me how to create an if else loop for 10 different numbers

Member Avatar for jon.kiparsky

I'd suggest you post this in a new thread rather than bouncing up an only slightly-related one from two years ago. When you do that, you might want to me a little more specific about what you want to do, and show us what you've tried and what's not working about it. That might get you a better response.
Before you do that, though, read the sticky threads at the top of this forum - if you haven't read Eric Raymond's piece on "How to Ask Questions the Smart Way" you're not done reading yet.

Member Avatar for bobbyfischer 
class doWhileDemo 
    {
        public static void main(String arg[])
        {
            int x = 1;
            int y = 2*x + x;
            
            
            do {
                System.out.println("y=:"+ y);
                ++x;
               }
               while(x<10);
               
        }
    }

am trying to parse the value of x after addition to the operation for y but it aint working

Member Avatar for jon.kiparsky

If you didn't read my previous post, please read my previous post, and then start a new thread to ask your question.

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