programj

I'm trying to display an average of grades.
I don't know what I'm doing wrong but I'm trying to set up:

- a BufferReader

- float grades [] = new float [variable];

- use 3 'for loops'
one loop to put in grades while asking user to enter grades, a loop to get data inside array and compute average, and a loop to output grades

here is what I have so far:

ReggaetonKing

[PHP]
//used to get average of grades
public int Average()
{
int sumOfGrades = 0;
for (int i = 0; i < grades.length; i++)
{
sumOfGrades += grades[i];
}
//you can change the varible type, I am just using int for an example
int average = (sum / grades.length);
return average;
}
//used to output the grades
public void showGrades()
{
for (int i = 0; i < grades.length; i++)
System.out.println("Grade #" + i + 1 + " = " + grades[i]);
}
[/PHP]
and for the loop to put in grades while asking user to enter grades, it looks like it's in your program already. I hope this helps.

__________________
I would love to change the world, but they won't give me the source code!

programj

where in my code do I add what you put?
and am I suppose to delete something to add what you have?

ReggaetonKing

[PHP]
import javax.swing.*;
// Computes the average of a series of scores
public class averaginggrades
{
// the array that holds the scores
private static int[] grades;

public static void main(String[] args)
{
// Prompt user to enter number of grades
String input = JOptionPane.showInputDialog("Enter number of grades:");
int numberOfgrades = Integer.parseInt(input);

// initialize array
grades = new int[numberOfgrades];

// Prompt user to enter grades and store them in an array
for (int i = 0; i < grades.length; i++)
{
input = JOptionPane.showInputDialog("Enter grade #" + (i + 1) + ": ");
grades[i] = Integer.parseInt(input);
System.out.println("grades #" + (i + 1) + " = " + grades[i]);
}
// Compute sum of scores
int sum = 0;

for (int i = 0; i < grades.length; i++)
{
sum += grades[i];
}
int largest = grades[0];

for (int i = 0; i < grades.length; i++)
{
if (grades[i] > largest)
largest = grades[i];
}
int smallest = grades[0];
for (int i = 1; i < grades.length; i++)
{
if(grades[i] < smallest)
smallest = grades[i];
}
// Display average grades
System.out.println("grade average = " + Average());
// outputs the grades
showGrades()
}
//used to get average of grades
public static int Average()
{
int sumOfGrades = 0;
for (int i = 0; i < grades.length; i++)
sumOfGrades += grades[i];
//you can change the varible type, I am just using int for an example
int average = (sum / grades.length);
return average;
}
//used to output the grades
public static void showGrades()
{
for (int i = 0; i < grades.length; i++)
System.out.println("Grade #" + i + 1 + " = " + grades[i]);
}
}
[/PHP]
This should be it. The whole code.

__________________
I would love to change the world, but they won't give me the source code!

programj

here's the error I got when I tried to compile it:

C:\Documents and Settings\Desktop\averaginggrades.java:48: ';' expected
}
^
1 error

Tool completed with exit code 1

ReggaetonKing

add a ";" to showGrades(), lol

__________________
I would love to change the world, but they won't give me the source code!

programj

lol ok I did that and now this comes up:

C:\Documents and Settings\Desktop\averaginggrades.java:56: cannot find symbol
symbol : variable sum
location: class averaginggrades
int average = (sum / grades.length);
^
1 error

Tool completed with exit code 1

programj

the up arrow is actually pointing under the "s" in sum

Ooble

According to the error message, it can't find the sum variable. So figure out what's going wrong. In that function, the variable doesn't exist. However, there is a sumOfGrades variable, and I'd bet that's what you're looking for.

You gotta try and do stuff yourself. Problem solving is the fun part of coding.

__________________
Me :: You :: Them

programj

fun went out the window a few hours ago,
I've been trying to figure this out all day that's why I came here for help