Printable View
Hello guys!
I have a 2d array with students and their marks! i have to calculate the averge for each student. The program compiles but the average remains 0. please help!!
public double calculateResponseAverage(String filename)
{
int col=10;
int row =8;
array = new int[row][col];
double avg=0;
for (int i=0; i<array.length; i++)
{
int sum=0;
for (int j=0; j<array[0].length; j++)
{
sum +=array[0][j];
}
avg = avg/array[0].length;
avg += sum;
}
return avg;
First, it is best to put your formatted code between [code][/code] tags.
Code:
public double calculateResponseAverage(String filename) {
int col=10;
int row =8;
array = new int[row][col];
double avg=0;
for (int i=0; i<array.length; i++)
{
int sum=0;
for (int j=0; j<array[0].length; j++)
{
sum +=array[0][j];
}
avg = avg/array[0].length;
avg += sum;
}
return avg;
}
I believe you need to change your row index from 0 to i.
Jim
Nothing happened :/ and i have another method called results...how do i call the average method in the results method so the average of each student appears next to its grades??
public void displayResults()
{
System.out.println( "Responses for" );
for(int i=0; i<=7; i++)
{
System.out.print("#" + (i+1) + " ");
for (int j = 0; j <= 9; j++)
{
System.out.print(array [i][j]);
}
System.out.println();
}
}
You are also using ints. To calculate averages you need to use double to preserve the decimals. And you call your first method with a filename argument which isn't used. And you dividing avg by the number of entries, not the sum.
Jim
ohhh...let me try that