array help

[wolv]

Hi and thanks in advanced.

this is my first attempt at java and im having trouble because i want to do things like in C++.

ok i simply would like to create a program that will ask the user to enter a number of grades to be averaged. Store that number in a variable. Insert the veriable number in an array ( to set size ). Then promt the user to enter the gpa's to be averaged and save them in the array. heres my code so far.

import javax.swing.*;
import java.text.*;

public class average
{
public static void main(String args[])
{
String input;
int a = 0;
int c = 1;
double b = 0;


input = JOptionPane.showInputDialog("Please enter the number of grades to enter");
a = Integer.parseInt(input);

double[] average;
average = new double[a];

while(c <= a)
{
average[b] = JOptionPane.showInputDialog("Enter gpa #" + c); // <---------ERROR HERE
c =c+1;
}
//more to come here
System.exit(0);
}
}

i dont know enough java to know why this error is here, this is the error

C:\java>javac average.java
average.java:22: possible loss of precision
found   : double
required: int
average[b] = JOptionPane.showInputDialog("Enter gpa #" + c);
        ^
average.java:22: incompatible types
found   : java.lang.String
required: double
average[b] = JOptionPane.showInputDialog("Enter gpa #" + c);
                                        ^
2 errors

lol i hope any1 can help. again thanks in advanced and god bless

g.g.

[ArchAngel added CODE tags]

[ArchAngel]

None of your problems are really Java-specific - they're all typing problems that you get in any typed language.

1. You're trying to index an array with a varible of type 'double' (the variable 'b'). This doesn't make sense - it's equivalent to typing myArray[10.3]! The compiler message is saying that it expects you to use an 'int', rather than 'double'.

2. You're trying to assign a 'String' object (the value returned from .showInputDialog(...)) to a 'double' primitive (an element of the 'average' array). You can't just do that, you must parse the String into a double. For this, you can use Double.parseDouble(String):

http://java.sun.com/j2se/1.3/docs/api/index.html

Hope this helps.

[cjard]

hey wait a minute.. i know you..

(time to add my signature

[ArchAngel]

hehe...