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Need some help with my do-while and while loops

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Need some help with my do-while and while loops

 
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  #1
Oct 18th, 2004
I’m having problems with my do-while loops and my while loop. Also my switch statement ends and does not loop to ask for another input. I’m confused. Any suggestion that can help me or send me one the right track I would appreciate it.
This is the assignment:

The Miskatonic University’s math department wants you to write a computer program that will find all of the Rectangular Prisms with integer sides whose volume is equal to an inputted integer volume of cubic units (units can be feet, inches, meters, or whatever according to your preference).

The Miskatonic mathematicians realize that nested repetition will be required to solve this problem, and never missing a chance to test their statistical skills, they have an additional specification to this problem. The mathematicians have heard of while, for, and do-while loops and are interested in seeing how well they perform compared to one another. As such once you have discovered an algorithm to solve their Rectangular Prism Options problem, they want you to code the solution three times: once using only while loops, once using only for loops, and once using only do-while loops. The mathematicians want all of this code in one Java program which will allow the user to select which version of the algorithm to use (i.e., “Press 1 for while loops, Press 2 for for loops, Press 3 for do-while loops�). They require that you use a switch statement to accomplish this selection.

If the user inputs any non-positive values for the volume of the rectangular prism, then the program should display an error message and prompt the user for input again. Your list of Rectangular Prism Options should be displayed in a JScrollPane within a dialog box as shown in the example output below.


Here is my code so far:
Java Syntax (Toggle Plain Text) 
  1. import javax.swing.*;
  2.  
  3.     public class RectangularPrism
  4.    {
  5.        public static void main(String args[])
  6.       {
  7.          int counter = 0;                       //Sets counter to 1
  8.          int a, b, c, volume;                   //Volume of rectangular prism
  9.          int i;											//Case counter
  10.          int choice;                            //User's choice of method to solve                     
  11.          String inputFeet, inputChoice;         //Value entered by user
  12.          String output = "Solution #\tL*W*H\n";
  13.  
  14.       //Input Dialog Box for volume of recangular prism
  15.          inputFeet = JOptionPane.showInputDialog("Enter volume of a rectangular prism in feet");
  16.          volume = Integer.parseInt(inputFeet);
  17.  
  18.       //Input Dialog Box for choice of repetition method
  19.          inputChoice = JOptionPane.showInputDialog("Enter 1 to solve by While loops\nEnter 2 to solve by For loops\nEnter 3 to solve by a Do-While loop");
  20.          choice = Integer.parseInt(inputChoice);
  21.  
  22.       //Start user choice selection
  23.          switch (choice)
  24.          {
  25.             case 1: //While loop solution
  26.                a = 0; b = 0; c = 0; i = 0;
  27.                while (a <= volume)
  28.                {
  29.                   a++;
  30.                   while (b <= volume)
  31.                   {
  32.                      b++;
  33.                      while (c <= volume)
  34.                      {              
  35.                         c++;              
  36.                         while (a * b * c == volume)
  37.                         {
  38.                            counter++;
  39.                            output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  40.                            a = 0;
  41.                         }
  42.                      }
  43.                   }
  44.                }
  45.  
  46.                break;
  47.  
  48.             case 2: //For loop solution (Finished)
  49.                for (a = 0; a <= volume; a++)
  50.                {
  51.                   for (b = 0; b <= volume; b++)
  52.                   {
  53.                      for (c = 0; c <= volume; c++)
  54.                      {
  55.                         if ( a *  b * c == volume)
  56.                         {
  57.                            counter++;
  58.                            output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  59.                         }
  60.                      }
  61.                   }
  62.                }
  63.                break;
  64.  
  65.             case 3: //Do-while loop solution
  66.                a = 0; b = 0; c = 0;        
  67.                do
  68.                {
  69.                   do
  70.                   {
  71.                      do
  72.                      {
  73.                         do
  74.                         {
  75.                            c++;
  76.                         }while(c <= volume);
  77.         						b++;
  78.                      }while(b <= volume);
  79.        					b = 0;              
  80. 							b++;
  81.                   }while(c <= volume);
  82.                   counter++;
  83.                   output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  84.                }while(a * b * c == volume);
  85.                break;
  86.  
  87.             default: //Message diplayed if not a valid choice is chosen
  88.                JOptionPane.showMessageDialog(null,"Please enter a valid choice!");
  89.          }
  90.  
  91.       //Output += counter + ".\t" + volume;
  92.       //Output Dialog Box Outside informatio
  93.          JTextArea area = new JTextArea(15, 10);
  94.          area.setText(output);
  95.          JScrollPane scroller = new JScrollPane(area);
  96.          JOptionPane.showMessageDialog(null, scroller, "Volume of " + volume, JOptionPane.INFORMATION_MESSAGE);
  97.          System.exit(0);//End Program
  98.       }//End Main
  99.    }//End Class Rectangular Prism
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Re: Need some help with my do-while and while loops

 
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  #2
Oct 18th, 2004
where is your while loop ?? I didnt find any in your code.
http://www.technize.com
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Re: Need some help with my do-while and while loops

 
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  #3
Oct 18th, 2004
Case 1 and 2 I cannot come up with the solution.
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Re: Need some help with my do-while and while loops

 
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  #4
Oct 18th, 2004
To solve the problem with not looping to ask for a new input, you need to include the entire Dialog, Switch statements in a Do-while loop too.
In essance your main app, only asks for input once, and then processes the switch statment, and then exits the program.
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Re: Need some help with my do-while and while loops

 
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  #5
Oct 18th, 2004
I have updated my solution to work better...I need now to find a answer to my solutions because they are not all listed.

Java Syntax (Toggle Plain Text) 
  1.       import javax.swing.*;
  2.  
  3.     public class RectangularPrism
  4.    {
  5.        public static void main(String args[])
  6.       {
  7.          int counter = 0;                       //Sets counter to 1
  8.          int a, b, c, volume;                   //Volume of rectangular prism
  9.          int choice;                            //User's choice of method to solve                     
  10.          String inputFeet, inputChoice;         //Value entered by user
  11.          String output = "Solution #\tL*W*H\n";
  12.  
  13.       //Input Dialog Box for volume of recangular prism
  14.          inputFeet = JOptionPane.showInputDialog("Enter volume of a rectangular prism in feet");
  15.          volume = Integer.parseInt(inputFeet);
  16.  
  17.       //Input Dialog Box for choice of repetition method
  18.          inputChoice = JOptionPane.showInputDialog("Enter 1 to solve by While loops\nEnter 2 to solve by For loops\nEnter 3 to solve by a Do-While loop");
  19.          choice = Integer.parseInt(inputChoice);
  20.  
  21.       //Start user choice selection
  22.          switch (choice)
  23.          {
  24.             case 1: //While loop solution
  25.                a = 0; b = 0; c = 0; i = 0;
  26.                while (a <= volume)
  27.                {
  28.                   b = a + 1;
  29.                   while (b <= volume)
  30.                   {
  31.                      c = 1;
  32.                      if (a * b * c == volume)
  33.                      {
  34.                         counter++;
  35.                         output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  36.                      }
  37.                      c++;
  38.                      b++;
  39.                   }
  40.                   a++;
  41.                }
  42.  
  43.                break;
  44.  
  45.             case 2: //For loop solution 
  46.  
  47.                for (a = 0; a <= volume; a++)
  48.                {
  49.                   for (b = a + 1; b <= volume; b++)
  50.                   {
  51.                      c = 1;
  52.                      if (a *  b * c == volume)
  53.                      {
  54.                         counter++;
  55.                         output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  56.                      }
  57.                      c++;
  58.                   }
  59.                }
  60.                break;
  61.  
  62.             case 3: //Do-while loop solution
  63.                a = 0; b = 0; c = 0;        
  64.                do
  65.                {
  66.                   b = a + 1;
  67.                   do
  68.                   {
  69.                      c = 1;
  70.                      if (a * b * c == volume)
  71.                      {
  72.                         counter++;
  73.                         output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  74.                      }
  75.                      c++;
  76.                      b++;
  77.                   }while(b <= volume);
  78.                   a++;
  79.                }while(a <= volume);
  80.                break;
  81.  
  82.             default: //Message diplayed if not a valid choice is chosen
  83.                JOptionPane.showMessageDialog(null,"Please enter a valid choice!");
  84.          }
  85.  
  86.       //Output += counter + ".\t" + volume;
  87.       //Output Dialog Box Outside informatio
  88.          JTextArea area = new JTextArea(15, 10);
  89.          area.setText(output);
  90.          JScrollPane scroller = new JScrollPane(area);
  91.          JOptionPane.showMessageDialog(null, scroller, "Volume of " + volume, JOptionPane.INFORMATION_MESSAGE);
  92.          System.exit(0);//End Program
  93.       }//End Main
  94.    }//End Class Rectangular Prism
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Re: Need some help with my do-while and while loops

 
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  #6
Oct 18th, 2004
Almost perfect!!! One more thing to do is get my while loop solutions right (case 1). Everything else is great!!! This should not be hard for someone to figure out.

Java Syntax (Toggle Plain Text) 
  1.    import javax.swing.*;
  2.  
  3.     public class RectangularPrism
  4.    {
  5.        public static void main(String args[])
  6.       {
  7.          int counter = 0;                       //Sets counter to 1
  8.          int a, b, c, volume;                   //Volume of rectangular prism
  9.          int choice;                            //User's choice of method to solve                     
  10.          String inputFeet, inputChoice;         //Value entered by user
  11.          boolean run = false;                   //Choice Selection is wrong
  12.          String output = "Solution #\tL*W*H\n";
  13.  
  14.       //Input Dialog Box for volume of recangular prism
  15.          inputFeet = JOptionPane.showInputDialog("Enter volume of a rectangular prism in feet");
  16.          volume = Integer.parseInt(inputFeet);
  17.          while(!run)
  18.          {
  19.          //Input Dialog Box for choice of repetition method
  20.             inputChoice = JOptionPane.showInputDialog("Enter 1 to solve by While loops\nEnter 2 to solve by For loops\nEnter 3 to solve by a Do-While loop");
  21.             choice = Integer.parseInt(inputChoice);
  22.             if ((choice <= 3) && (choice >= 1))
  23.             {
  24.             //Start user choice selection
  25.                switch (choice)
  26.                {
  27.                   case 1: //While loop solution
  28.                      a = 0;
  29.                      while (a <= volume)
  30.                      {
  31.                         b = a;
  32.                         while (b <= volume)
  33.                         {
  34.                            c = a;
  35.                            while (c <= volume)
  36.                            {
  37.                               if (a * b * c == volume)
  38.                               {
  39.                                  counter++;
  40.                                  output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  41.                               }
  42.                               c++;
  43.                            }
  44.                            b++;
  45.                         }
  46.                         a++;
  47.                      }
  48.  
  49.                      break;
  50.  
  51.                   case 2: //For loop solution 
  52.                      for (a = 0; a <= volume; a++)
  53.                      {
  54.                         for (b = a; b <= volume; b++)
  55.                         {
  56.                            for (c = b; c <= volume; c++)
  57.                            {
  58.                               if (a *  b * c == volume)
  59.                               {
  60.                                  counter++;
  61.                                  output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  62.                               }
  63.                            }
  64.                         }
  65.                      }
  66.                      break;
  67.  
  68.                   case 3: //Do-while loop solution
  69.                      a = 0;        
  70.                      do
  71.                      {
  72.                         b = a;
  73.                         do
  74.                         {
  75.                            c = b;
  76.                            do
  77.                            {
  78.                               if (a * b * c == volume)
  79.                               {
  80.                                  counter++;
  81.                                  output += counter + ".\t" + a + ", " + b + ", " + c + "\n";
  82.                               }c++;
  83.                            }while(c <= volume);
  84.                            b++;
  85.                         }while(b <= volume);
  86.                         a++;
  87.                      }while(a <= volume);
  88.                      break;
  89.  
  90.                   default: //Message diplayed if not a valid choice is chosen
  91.                      JOptionPane.showMessageDialog(null,"Please enter a valid choice!");
  92.                }
  93.  
  94.             //Output Dialog Box Outside information
  95.                JTextArea area = new JTextArea(15, 10);
  96.                area.setText(output);
  97.                JScrollPane scroller = new JScrollPane(area);
  98.                JOptionPane.showMessageDialog(null, scroller, "Volume of " + volume, JOptionPane.INFORMATION_MESSAGE);
  99.                run = true;
  100.             }
  101.             else//Message displayed if not a valid choice is chosen 
  102.             {
  103.                JOptionPane.showMessageDialog(null,"Please enter a valid choice!");
  104.             }//End If/Else Statement
  105.          }//End While Statement
  106.          System.exit(0);//End Program
  107.       }//End Main
  108.    }//End Class Rectangular Prism
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Re: Need some help with my do-while and while loops

 
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  #7
Oct 19th, 2004
Finnaly finish it...In case 1 it is c = b not c = a. Thanks to everyone who tryed to help.
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