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Calculating average: Converting Double to String Error
2019 Community Moderator ElectionHow to generate a random alpha-numeric string?How do I read / convert an InputStream into a String in Java?How to get an enum value from a string value in Java?How can I convert a stack trace to a string?How to split a string in JavaConverting 'ArrayList<String> to 'String[]' in JavaConvert ArrayList<String> to String[] arrayHow do I convert a String to an int in Java?How to convert a char to a String?Why is char[] preferred over String for passwords?
I just can't get my code right how I want to. (Java Beginner)
So the way it should work is this:
When running the program I want to get a window and fill in a number(X) how large(Z) the array should be. Next I get X windows where I have to type in the numbers I want to put in the array. Finally the program should calculate the sum of all numbers and divide by the size(Z) of the array, to get the average of all numbers in the array.
I'm almost finished but all I get are errors regarding Double to String conversion. I tried everything I know out but couldn't make it work. Please excuse there may be spelling mistakes, I had to translate it to english.
Error:
Below //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
import javax.swing.*;
import java.util.*;
public class Aufgabe42
public static void main(String[] args)
//Declare variable
String input, output, requestNumber;
double[] arrayNumber;
int size;
//Input
input = JOptionPane.showInputDialog(null, "Type in the size of the array.");
//Variable Initialization
size = Integer.parseInt(input);
arrayNumbers = new double[size];
//Request numbers
for(int i = 0; i < size; i++)
requestNumber = JOptionPane.showInputDialog(null, "Tell me a number:");
arrayNumber[i] = Double.parseDouble(requestNumber);
String returnAverage;
//Initialization and Output
output = Double.toString(JOptionPane.showMessageDialog(null, "The Average is: " + getAverage(arrayNumber)));
System.exit(0);
public static double getAverage(double[] arrayNumber)
//Declare variable
double arraySum,average;
//Initialization
arraySum = 0;
returnAverage = Double.toString(average);
//Sum array values
for(int i = 0; i < arrayZNumber.length; i++)
arraySum += arrayNumber[i];
//Calculate Average
average = arraySum / arrayNumber.length;
return average;
java average
asked Mar 6 at 23:32
HipHip
265
|
show 1 more comment
I just can't get my code right how I want to. (Java Beginner)
So the way it should work is this:
When running the program I want to get a window and fill in a number(X) how large(Z) the array should be. Next I get X windows where I have to type in the numbers I want to put in the array. Finally the program should calculate the sum of all numbers and divide by the size(Z) of the array, to get the average of all numbers in the array.
I'm almost finished but all I get are errors regarding Double to String conversion. I tried everything I know out but couldn't make it work. Please excuse there may be spelling mistakes, I had to translate it to english.
Error:
Below //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
import javax.swing.*;
import java.util.*;
public class Aufgabe42
public static void main(String[] args)
//Declare variable
String input, output, requestNumber;
double[] arrayNumber;
int size;
//Input
input = JOptionPane.showInputDialog(null, "Type in the size of the array.");
//Variable Initialization
size = Integer.parseInt(input);
arrayNumbers = new double[size];
//Request numbers
for(int i = 0; i < size; i++)
requestNumber = JOptionPane.showInputDialog(null, "Tell me a number:");
arrayNumber[i] = Double.parseDouble(requestNumber);
String returnAverage;
//Initialization and Output
output = Double.toString(JOptionPane.showMessageDialog(null, "The Average is: " + getAverage(arrayNumber)));
System.exit(0);
public static double getAverage(double[] arrayNumber)
//Declare variable
double arraySum,average;
//Initialization
arraySum = 0;
returnAverage = Double.toString(average);
//Sum array values
for(int i = 0; i < arrayZNumber.length; i++)
arraySum += arrayNumber[i];
//Calculate Average
average = arraySum / arrayNumber.length;
return average;
java average
asked Mar 6 at 23:32
HipHip
265
Please edit your question to include the error you're getting and to indicate which line of your code is causing it.
– azurefrog
Mar 6 at 23:34
I have like 5 versions of the code now. But it always tells me the err is in the //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
– Hip
Mar 6 at 23:38
The return type ofJOptionPane.showMessageDialogisvoid: it does not return anything. You cannot use it as an argument toDouble.toString(). Why do you think you need to do that?
– Kevin Anderson
Mar 7 at 0:30
That was recommend by someone on a forum post I have read so I tried this out. I also tried out to convert it like this 'variable = Double.toString(variableOne);' So how can I convert it?
– Hip
Mar 7 at 0:41
There's no point in assigning something tooutputimmediately before exiting the program. If the last thing you want to do is pop up a dialog to display your result, then just writeJOptionPane.showMessageDialog(null, "The average is: ",...);".JOptionPane.showMessageDialog' returns nothing; there's nothing to "convert".
– Kevin Anderson
Mar 7 at 0:54
|
show 1 more comment
I just can't get my code right how I want to. (Java Beginner)
So the way it should work is this:
When running the program I want to get a window and fill in a number(X) how large(Z) the array should be. Next I get X windows where I have to type in the numbers I want to put in the array. Finally the program should calculate the sum of all numbers and divide by the size(Z) of the array, to get the average of all numbers in the array.
I'm almost finished but all I get are errors regarding Double to String conversion. I tried everything I know out but couldn't make it work. Please excuse there may be spelling mistakes, I had to translate it to english.
Error:
Below //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
import javax.swing.*;
import java.util.*;
public class Aufgabe42
public static void main(String[] args)
//Declare variable
String input, output, requestNumber;
double[] arrayNumber;
int size;
//Input
input = JOptionPane.showInputDialog(null, "Type in the size of the array.");
//Variable Initialization
size = Integer.parseInt(input);
arrayNumbers = new double[size];
//Request numbers
for(int i = 0; i < size; i++)
requestNumber = JOptionPane.showInputDialog(null, "Tell me a number:");
arrayNumber[i] = Double.parseDouble(requestNumber);
String returnAverage;
//Initialization and Output
output = Double.toString(JOptionPane.showMessageDialog(null, "The Average is: " + getAverage(arrayNumber)));
System.exit(0);
public static double getAverage(double[] arrayNumber)
//Declare variable
double arraySum,average;
//Initialization
arraySum = 0;
returnAverage = Double.toString(average);
//Sum array values
for(int i = 0; i < arrayZNumber.length; i++)
arraySum += arrayNumber[i];
//Calculate Average
average = arraySum / arrayNumber.length;
return average;
java average
asked Mar 6 at 23:32
HipHip
265
I just can't get my code right how I want to. (Java Beginner)
So the way it should work is this:
When running the program I want to get a window and fill in a number(X) how large(Z) the array should be. Next I get X windows where I have to type in the numbers I want to put in the array. Finally the program should calculate the sum of all numbers and divide by the size(Z) of the array, to get the average of all numbers in the array.
I'm almost finished but all I get are errors regarding Double to String conversion. I tried everything I know out but couldn't make it work. Please excuse there may be spelling mistakes, I had to translate it to english.
Error:
Below //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
import javax.swing.*;
import java.util.*;
public class Aufgabe42
public static void main(String[] args)
//Declare variable
String input, output, requestNumber;
double[] arrayNumber;
int size;
//Input
input = JOptionPane.showInputDialog(null, "Type in the size of the array.");
//Variable Initialization
size = Integer.parseInt(input);
arrayNumbers = new double[size];
//Request numbers
for(int i = 0; i < size; i++)
requestNumber = JOptionPane.showInputDialog(null, "Tell me a number:");
arrayNumber[i] = Double.parseDouble(requestNumber);
String returnAverage;
//Initialization and Output
output = Double.toString(JOptionPane.showMessageDialog(null, "The Average is: " + getAverage(arrayNumber)));
System.exit(0);
public static double getAverage(double[] arrayNumber)
//Declare variable
double arraySum,average;
//Initialization
arraySum = 0;
returnAverage = Double.toString(average);
//Sum array values
for(int i = 0; i < arrayZNumber.length; i++)
arraySum += arrayNumber[i];
//Calculate Average
average = arraySum / arrayNumber.length;
return average;
java average
java average
asked Mar 6 at 23:32
HipHip
265
asked Mar 6 at 23:32
HipHip
265
edited Mar 6 at 23:40
Hip
asked Mar 6 at 23:32
HipHip
265
asked Mar 6 at 23:32
HipHip
265
asked Mar 6 at 23:32
HipHip
265
265
Please edit your question to include the error you're getting and to indicate which line of your code is causing it.
– azurefrog
Mar 6 at 23:34
I have like 5 versions of the code now. But it always tells me the err is in the //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
– Hip
Mar 6 at 23:38
The return type ofJOptionPane.showMessageDialogisvoid: it does not return anything. You cannot use it as an argument toDouble.toString(). Why do you think you need to do that?
– Kevin Anderson
Mar 7 at 0:30
That was recommend by someone on a forum post I have read so I tried this out. I also tried out to convert it like this 'variable = Double.toString(variableOne);' So how can I convert it?
– Hip
Mar 7 at 0:41
There's no point in assigning something tooutputimmediately before exiting the program. If the last thing you want to do is pop up a dialog to display your result, then just writeJOptionPane.showMessageDialog(null, "The average is: ",...);".JOptionPane.showMessageDialog' returns nothing; there's nothing to "convert".
– Kevin Anderson
Mar 7 at 0:54
|
show 1 more comment
Please edit your question to include the error you're getting and to indicate which line of your code is causing it.
– azurefrog
Mar 6 at 23:34
I have like 5 versions of the code now. But it always tells me the err is in the //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
– Hip
Mar 6 at 23:38
The return type ofJOptionPane.showMessageDialogisvoid: it does not return anything. You cannot use it as an argument toDouble.toString(). Why do you think you need to do that?
– Kevin Anderson
Mar 7 at 0:30
That was recommend by someone on a forum post I have read so I tried this out. I also tried out to convert it like this 'variable = Double.toString(variableOne);' So how can I convert it?
– Hip
Mar 7 at 0:41
There's no point in assigning something tooutputimmediately before exiting the program. If the last thing you want to do is pop up a dialog to display your result, then just writeJOptionPane.showMessageDialog(null, "The average is: ",...);".JOptionPane.showMessageDialog' returns nothing; there's nothing to "convert".
– Kevin Anderson
Mar 7 at 0:54
Please edit your question to include the error you're getting and to indicate which line of your code is causing it.
– azurefrog
Mar 6 at 23:34
Please edit your question to include the error you're getting and to indicate which line of your code is causing it.
– azurefrog
Mar 6 at 23:34
I have like 5 versions of the code now. But it always tells me the err is in the //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
– Hip
Mar 6 at 23:38
I have like 5 versions of the code now. But it always tells me the err is in the //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
– Hip
Mar 6 at 23:38
The return type of
JOptionPane.showMessageDialog is void: it does not return anything. You cannot use it as an argument to Double.toString(). Why do you think you need to do that?– Kevin Anderson
Mar 7 at 0:30
The return type of
JOptionPane.showMessageDialog is void: it does not return anything. You cannot use it as an argument to Double.toString(). Why do you think you need to do that?– Kevin Anderson
Mar 7 at 0:30
That was recommend by someone on a forum post I have read so I tried this out. I also tried out to convert it like this 'variable = Double.toString(variableOne);' So how can I convert it?
– Hip
Mar 7 at 0:41
That was recommend by someone on a forum post I have read so I tried this out. I also tried out to convert it like this 'variable = Double.toString(variableOne);' So how can I convert it?
– Hip
Mar 7 at 0:41
There's no point in assigning something to
output immediately before exiting the program. If the last thing you want to do is pop up a dialog to display your result, then just write JOptionPane.showMessageDialog(null, "The average is: ",...);". JOptionPane.showMessageDialog' returns nothing; there's nothing to "convert".– Kevin Anderson
Mar 7 at 0:54
There's no point in assigning something to
output immediately before exiting the program. If the last thing you want to do is pop up a dialog to display your result, then just write JOptionPane.showMessageDialog(null, "The average is: ",...);". JOptionPane.showMessageDialog' returns nothing; there's nothing to "convert".– Kevin Anderson
Mar 7 at 0:54
|
show 1 more comment
1 Answer
1
active
oldest
votes
JOptionPane.showMessageDialog()
Has a void return type. You either want
JOptionPane.showInputDialog()
Or to remove
Double output = Double.valueOf(JOptionPane.showMessageDialog...)
near the end
https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
answered Mar 6 at 23:38
Asa WittAsa Witt
211
add a comment |
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1 Answer
1
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
JOptionPane.showMessageDialog()
Has a void return type. You either want
JOptionPane.showInputDialog()
Or to remove
Double output = Double.valueOf(JOptionPane.showMessageDialog...)
near the end
https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
answered Mar 6 at 23:38
Asa WittAsa Witt
211
add a comment |
JOptionPane.showMessageDialog()
Has a void return type. You either want
JOptionPane.showInputDialog()
Or to remove
Double output = Double.valueOf(JOptionPane.showMessageDialog...)
near the end
https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
answered Mar 6 at 23:38
Asa WittAsa Witt
211
add a comment |
JOptionPane.showMessageDialog()
Has a void return type. You either want
JOptionPane.showInputDialog()
Or to remove
Double output = Double.valueOf(JOptionPane.showMessageDialog...)
near the end
https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
answered Mar 6 at 23:38
Asa WittAsa Witt
211
JOptionPane.showMessageDialog()
Has a void return type. You either want
JOptionPane.showInputDialog()
Or to remove
Double output = Double.valueOf(JOptionPane.showMessageDialog...)
near the end
https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
answered Mar 6 at 23:38
Asa WittAsa Witt
211
answered Mar 6 at 23:38
Asa WittAsa Witt
211
answered Mar 6 at 23:38
Asa WittAsa Witt
211
answered Mar 6 at 23:38
Asa WittAsa Witt
211
211
add a comment |
add a comment |
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Please edit your question to include the error you're getting and to indicate which line of your code is causing it.
– azurefrog
Mar 6 at 23:34
I have like 5 versions of the code now. But it always tells me the err is in the //Initialization and Output line, either it's 'void' type not allowed here or incompatible types: void cannot be converted to String
– Hip
Mar 6 at 23:38
The return type of
JOptionPane.showMessageDialogisvoid: it does not return anything. You cannot use it as an argument toDouble.toString(). Why do you think you need to do that?– Kevin Anderson
Mar 7 at 0:30
That was recommend by someone on a forum post I have read so I tried this out. I also tried out to convert it like this 'variable = Double.toString(variableOne);' So how can I convert it?
– Hip
Mar 7 at 0:41
There's no point in assigning something to
outputimmediately before exiting the program. If the last thing you want to do is pop up a dialog to display your result, then just writeJOptionPane.showMessageDialog(null, "The average is: ",...);".JOptionPane.showMessageDialog' returns nothing; there's nothing to "convert".– Kevin Anderson
Mar 7 at 0:54