I need to display the sum and the average without initializing num and num2. 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 varables values. Any help?
-------------------------------------------------- - import java.io.*;
-
import javax.swing.*;
-
-
class Numbert
-
-
-
-
{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. Ugh..");
-
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
-
}
-
-
}
26  1985 
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? num and num2 must get a value somehow...
Besides other errors you can make those variables static class variables so the
JVM will initialize them to zero for you.
kind regards,
Jos
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.
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? 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.
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.
Ok here's a spoiler: what keeps you from doing the following after num and num2
have reveived their values: -
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 ;-)
kind regards,
Jos
Ok here's a spoiler: what keeps you from doing the following after num and num2
have reveived their values:
-
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 ;-)
kind regards,
Jos
I got that far but when I compiled it it said that num wasn't initialized.. And I don't know how to fix that. So I erased it and posted what I had.
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
}
}
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
}
}
I figured it out.. I was defining the sum/avg before num and num2 could be assigned values by the user. Schweet.
\
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 for now, suckahfish!"); //always executed
}
}
Okay. My professor introduced arrays last class and now I have to use an array to represent 20 values and display the average.
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 like your professor showed you. Then figure out how to find the sum and average of any amount of numbers, not just 20. (That will be more impressive!)
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 like your professor showed you. Then figure out how to find the sum and average of any amount of numbers, not just 20. (That will be more impressive!)
Yeah. I can do any number with the fixed code above. I'll see what I can do.
--Edit: Thanks for all the help/replies guys. Helps a lot.
Heh, my teacher won't re-post the code that he gave us the last day of class before spring break it was something like intarr=newarr[]; or something.. Gah1
Take a look at this link
http://java.sun.com/docs/books/tutor...ts/arrays.html
nomad
I don't know if I did it the long way or whatever but I got it to work. - import java.io.*;
-
import javax.swing.*;
-
-
class ArrT
-
{
-
-
public static void main (String[] args) throws IOException {
-
String inData;
-
int[] anArray;
-
-
anArray = new int[20];
-
-
anArray[0] = 0;
-
anArray[1] = 0;
-
anArray[2] = 0;
-
anArray[3] = 0;
-
anArray[4] = 0;
-
anArray[5] = 0;
-
anArray[6] = 0;
-
anArray[7] = 0;
-
anArray[8] = 0;
-
anArray[9] = 0;
-
anArray[10] = 0;
-
anArray[11] = 0;
-
anArray[12] = 0;
-
anArray[13] = 0;
-
anArray[14] = 0;
-
anArray[15] = 0;
-
anArray[16] = 0;
-
anArray[17] = 0;
-
anArray[18] = 0;
-
anArray[19] = 0;
-
-
inData = JOptionPane.showInputDialog (null, "Enter an Integer Value.") ;
-
anArray[0] = Integer.parseInt ( inData); // convert inData to int
-
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[1] = Integer.parseInt ( inData);
-
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[2] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[3] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[4] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[5] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[6] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[7] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[8] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[9] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[10] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[11] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "YOUSUCK! ENTER ANOHTER ONE.");
-
anArray[12] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[13] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[14] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "This isn't over...");
-
anArray[15] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[16] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Suck it blue!");
-
anArray[17] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[18] = Integer.parseInt ( inData);
-
inData = JOptionPane.showInputDialog (null, "Enter another Integer Value.");
-
anArray[19] = Integer.parseInt ( inData);
-
-
-
int sum = anArray[0] + anArray[1] + anArray[2] + anArray[3] + anArray[4] + anArray[5] + anArray[6]
-
+ anArray[7] + anArray[8] + anArray[9] + anArray[10] + anArray[11] + anArray[12] + anArray[13] +
-
anArray[14] + anArray[15] + anArray[16] +anArray[17] + anArray[18] + anArray[19];
-
int avg = sum/20;
-
-
System.out.println ("Sum of your sorry list of numbers is:" +sum);
-
System.out.println ("The average is:" +avg);
-
-
System.out.println ("Good-bye for now, suckahfish!"); //always executed
-
}
-
-
}
-
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. I feel really proud, heh.
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? num and num2 must get a value somehow...
You know? After you posted this every time I create something I think of this post? lol
Do - for(int i =0;i < anArray.length;i++ ) {
-
System.out.println(anArray[i]);
-
}
before that string of anArray[i] = 0; to find out for yourself what values the array locations are initialized to.
You know? After you posted this every time I create something I think of this post? lol
Now here's a little challenge. Use a for-loop for capturing the numbers from the user so that your code becomes shorter(fewer lines of code).
Do
- for(int i =0;i < anArray.length;i++ ) {
-
System.out.println(anArray[i]);
-
}
before that string of anArray[i] = 0; to find out for yourself what values the array locations are initialized to.
I don't know what all of this means..
java.lang.NullPointerException
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:269)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 99)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 51)
at bluej.runtime.ExecServer$3.run(ExecServer.java:787 )
All the ints are zero instead of the user entering them and I am really confused, heh. I can't find enough information about arrays >.<
I don't know what all of this means..
java.lang.NullPointerException
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:269)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 99)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 51)
at bluej.runtime.ExecServer$3.run(ExecServer.java:787 )
All the ints are zero instead of the user entering them and I am really confused, heh. I can't find enough information about arrays >.<
Can you post your updated codes?
sukatoa
this is the way u should do it......- import java.io.*;
import javax.swing.*;
class Number
{
public static void main (String[] args) throws IOException
{
String inData;
int num,num2;
int sum=0;
int avg=0;
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. Ugh..");
num2 = Integer.parseInt ( inData);
sum=num+num2;
avg=sum/2;
System.out.println ("Sum of both numbers:" +sum);
System.out.println ("The average is:" +avg);
System.out.println ("Good-bye for now"); //always executed
}
}
this is the way u should do it......
-
import java.io.*;
import javax.swing.*;
class Number
{
public static void main (String[] args) throws IOException
{
String inData;
int num,num2;
int sum=0;
int avg=0;
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. Ugh..");
num2 = Integer.parseInt ( inData);
sum=num+num2;
avg=sum/2;
System.out.println ("Sum of both numbers:" +sum);
System.out.println ("The average is:" +avg);
System.out.println ("Good-bye for now"); //always executed
}
}
1.) Use code tags when posting code.
2.) Do not attempt to spoonfeed, it's against site rules.
3.) Always declare variables closest to where they are used.
4.) There already is a class called Number in the java.lang package. Always try to make sure that your class names do not clash with standard Java classes.
5.) The OP wants to get the average of possibly more than two numbers.
I need to display the sum and the average without initializing num and num2. 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 varables values. Any help?
--------------------------------------------------
- import java.io.*;
-
import javax.swing.*;
-
-
class Numbert
-
-
-
-
{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. Ugh..");
-
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
-
}
-
-
}
hi...
you should try the following code to fix the problem..
your code is givin problem cause u r displaying something without giving any value to them... import java.io.*;
import javax.swing.*;
class Numbert
{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. Ugh..");
num2 = Integer.parseInt ( inData);
sum=num+num2;
avg=sum/2;
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
}
}
hi...
you should try the following code to fix the problem..
your code is givin problem cause u r displaying something without giving any value to them...
import java.io.*;
import javax.swing.*;
class Numbert
{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. Ugh..");
num2 = Integer.parseInt ( inData);
sum=num+num2;
avg=sum/2;
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
}
}
Please read items numbered 1,2,3, and 5 in my reply (post #22) above.
I need to make a program in java that does this with if statement. /*greater than or equal to 10 ifPGM
* Display a "happy Message"
*
* else
* if value less than 10 ;
* display an error message
*/
I need to make a program in java that does this with if statement. /*greater than or equal to 10 ifPGM
* Display a "happy Message"
*
* else
* if value less than 10 ;
* display an error message
*/
Can you post your best effort at this and then ask a specific question about the code?
I need to make a program in java that does this with if statement. /*greater than or equal to 10 ifPGM
* Display a "happy Message"
*
* else
* if value less than 10 ;
* display an error message
*/
To do this, you need to know how to use 'if statement' and how to display a message.
If you can work on these well, there would be no difficulty in using these properly to accomplish what you are trying to do.
The initial declarations and writing main class in Java are just the basics. i hope you can put these all together right now.
Regards
Qi
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