newbie question in java

latchu · #1 (**permalink**) 03-26-2008, 12:40 AM

hi there,

I need to display the sum and the average without initializing passing inputs. I can't figure it out and it's killing me. I can't seem to get the sum or average displayed without assigning the variables values.

Code:

 
      import java.io.*;
   
      import javax.swing.*;
  
      class Number
 
       {
      public static void main (String[] args) throws IOException
  
         { 
            String   inData;
  
            int num,num2;
 
            int sum;
  
            int avg;
  
            inData = JOptionPane.showInputDialog (null, "Enter an Integer Value. NOW!") ;
  
            num = Integer.parseInt ( inData); // convert inData to int
           
            inData = JOptionPane.showInputDialog (null, "Enter another Integer Value..");
 
            num2 = Integer.parseInt ( inData);             
           
            System.out.println ("Sum of both numbers:" +sum);
 
            System.out.println ("The average is:" +avg);
 
            System.out.println ("Good-bye!");  //always executed
          }
 
      }

leoraja8 · #2 (**permalink**) 03-26-2008, 12:47 AM

You don't have any code for calculating the sum or the average. What do you mean, you have to display them without initializing ? num and num2 must get a value somehow...

amansundar · #3 (**permalink**) 03-26-2008, 12:49 AM

Besides other errors you can make those variables static class variables so the
JVM will initialize them to zero for you.

latchu · #4 (**permalink**) 03-26-2008, 12:51 AM

I'm really new to java and I don't exactly know how to make the variables static classes. Or do anything else to be honest. I did a tutorial and it didn't help.

latchu · #5 (**permalink**) 03-26-2008, 12:52 AM

Quote:

You don't have any code for calculating the sum or the average. What do you mean, you have to display them without initializing? num and num2 must get a value somehow...

They need to get their value from the user entering a number and after they enter the two numbers I need to have the program display the sum and the average.

amansundar · #6 (**permalink**) 03-26-2008, 12:55 AM

Quote:

They need to get their value from the user entering a number and after they enter the two numbers I need to have the program display the sum and the average.

k here's a way i found: what keeps you from doing the following after num and num2
have received their values:

Code:

  
      sum= num+num2;
  
      avg= sum/2;

It's a spoiler so you have to figure out how it works yourself. And you have to show
us your working code. You don't have to perform the secret dance though ;-)

latchu · #7 (**permalink**) 03-26-2008, 12:57 AM

I got that far but when I compiled.. am getting num wasn't initialized.. And I don't know how to fix that. So I erased it and posted what I had.

latchu · #8 (**permalink**) 03-26-2008, 12:59 AM

Code:

import java.io.*;
import javax.swing.*;

class Numbert
{


int num , num2;
int sum= num+num2;
int avg= sum/2;

{public static void main (String[] args) throws IOException
{ String inData;

inData = JOptionPane.showInputDialog (null, "Enter an Integer Value.") ;
num = Integer.parseInt ( inData); // convert inData to int

inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
num2 = Integer.parseInt ( inData);

System.out.println ("Sum of both numbers:" +sum);
System.out.println ("The average is:" +avg);

System.out.println ("Good-bye for now, suckahfish!"); //always executed
}

}

latchu · #9 (**permalink**) 03-26-2008, 01:00 AM

I figured it out.. I was defining the sum/avg before num and num2 could be assigned values by the user.

import java.io.*;
import javax.swing.*;

class Numbert
{

int num , num2;

{public static void main (String[] args) throws IOException
{ String inData;

inData = JOptionPane.showInputDialog (null, "Enter an Integer Value.") ;
num = Integer.parseInt ( inData); // convert inData to int

inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
num2 = Integer.parseInt ( inData);

int sum= num+num2;
int avg= sum/2;

System.out.println ("Sum of both numbers:" +sum);
System.out.println ("The average is:" +avg);

System.out.println ("Good-bye); //always executed
}

}

leoraja8 · #10 (**permalink**) 03-26-2008, 01:02 AM

OK, so what do you have so far to accomplish this task?

You've got this working for 2 numbers. Instead of making 20 variables named num, num2, num3, num4,...etc., use an array. Then figure out how to find the sum and average of any amount of numbers, not just 20. (That will be more impressive!)

latchu · #11 (**permalink**) 03-26-2008, 01:05 AM

Yeah. I can do any number with the fixed code above. I'll see what I can do.

Thanks for all the help/replies guys.this community brings out me a lot.

amansundar · #12 (**permalink**) 03-28-2008, 03:17 AM

Take a look at this link
http://java.sun.com/docs/books/tuto...lts/arrays.html

latchu · #13 (**permalink**) 03-28-2008, 03:21 AM

I don't know if I did it the long way or whatever but I got it to work.

Code:

   1.
      import java.io.*;
   2.
      import javax.swing.*;
   3.
       
   4.
          class ArrT
   5.
      {
   6.
       
   7.
      public static void main (String[] args) throws IOException {
   8.
              String inData;
   9.
              int[] anArray;
  10.
             
  11.
              anArray = new int[20];
  12.
             
  13.
              anArray[0] = 0;
  14.
              anArray[1] = 0;
  15.
              anArray[2] = 0;
  16.
              anArray[3] = 0;
  17.
              anArray[4] = 0;
  18.
              anArray[5] = 0;
  19.
              anArray[6] = 0;
  20.
              anArray[7] = 0;
  21.
              anArray[8] = 0;
  22.
              anArray[9] = 0;
  23.
              anArray[10] = 0;
  24.
              anArray[11] = 0;
  25.
              anArray[12] = 0;
  26.
              anArray[13] = 0;
  27.
              anArray[14] = 0;
  28.
              anArray[15] = 0;
  29.
              anArray[16] = 0;
  30.
              anArray[17] = 0;
  31.
              anArray[18] = 0;
  32.
              anArray[19] = 0;         
  33.
                               
  34.
              inData = JOptionPane.showInputDialog (null, "Enter an Integer Value.") ;
  35.
              anArray[0] = Integer.parseInt ( inData); // convert inData to int
  36.
             
  37.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  38.
              anArray[1] = Integer.parseInt ( inData);
  39.
             
  40.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  41.
              anArray[2] = Integer.parseInt ( inData);
  42.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  43.
              anArray[3] = Integer.parseInt ( inData);
  44.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  45.
              anArray[4] = Integer.parseInt ( inData);
  46.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  47.
              anArray[5] = Integer.parseInt ( inData);
  48.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  49.
              anArray[6] = Integer.parseInt ( inData);
  50.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  51.
              anArray[7] = Integer.parseInt ( inData);
  52.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  53.
              anArray[8] = Integer.parseInt ( inData);
  54.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  55.
              anArray[9] = Integer.parseInt ( inData);
  56.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  57.
              anArray[10] = Integer.parseInt ( inData);
  58.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  59.
              anArray[11] = Integer.parseInt ( inData);
  60.
              inData = JOptionPane.showInputDialog (null, "YOUSUCK! ENTER ANOHTER ONE.");
  61.
              anArray[12] = Integer.parseInt ( inData);
  62.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  63.
              anArray[13] = Integer.parseInt ( inData);
  64.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  65.
              anArray[14] = Integer.parseInt ( inData);
  66.
              inData = JOptionPane.showInputDialog (null, "This isn't over...");
  67.
              anArray[15] = Integer.parseInt ( inData);
  68.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  69.
              anArray[16] = Integer.parseInt ( inData);
  70.
              inData = JOptionPane.showInputDialog (null, "Suck it blue!");
  71.
              anArray[17] = Integer.parseInt ( inData);
  72.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  73.
              anArray[18] = Integer.parseInt ( inData);
  74.
              inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
  75.
              anArray[19] = Integer.parseInt ( inData);
  76.
             
  77.
             
  78.
             int sum = anArray[0] + anArray[1] + anArray[2] + anArray[3] + anArray[4] + anArray[5] + anArray[6]
  79.
             + anArray[7] +  anArray[8] + anArray[9] + anArray[10]  + anArray[11] + anArray[12] + anArray[13] +
  80.
             anArray[14] + anArray[15] + anArray[16]  +anArray[17]  + anArray[18] + anArray[19];
  81.
             int avg = sum/20;
  82.
             
  83.
              System.out.println ("Sum of your sorry list of numbers is:" +sum);
  84.
              System.out.println ("The average is:" +avg);
  85.
             
  86.
              System.out.println ("Good-bye for now, suckahfish!"); //always executed
  87.
      }
  88.
       
  89.
      }

Edit:

I did have a question though. Because I'm having the user input their own value for each of the 20 numbers does it matter that I initialized each of the arrays at 0? Any information here is appreciated. Thanks for keeping up with me.

amansundar · #14 (**permalink**) 03-28-2008, 03:23 AM

Do

Code:

 1.
      for(int i =0;i < anArray.length;i++ ) {
   2.
            System.out.println(anArray[i]);
   3.
      }

before that string of anArray[i] = 0; to find out for yourself what values the array locations are initialized to.

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