E. Hazard - 1 year ago 120
Java Question

# How to find average of elements in 2d array JAVA?

I need help with the following program:

"Write a method that will take a two-dimensional array of doubles as an input parameter & return the average of the elements of the array."

Can anyone tell me how to go about it?

My current code:

``````public static double average(float arr[][]) {
double sum = 0;
int count = 0;
for (int row = 0; row < arr.length; row++)
for (int col = 0; col < arr[0].length; col++)
{
sum += arr[row][col];
count++;
}
return sum/count;
}
``````

I don't know how to let the user input the array elements and array dimensions (row/columns). Also how do I call this method from main? I am getting errors.

try this:

Code:

``````public class AverageElements {
private static double[][] array;

public static void main (String[] args){

//  Initialize array
initializeArray();

//  Calculate average
System.out.println(getAverage());
}

private static void initializeArray(){
array = new double[5][2];
array[0][0]=1.1;
array[0][1]=12.3;
array[1][0]=3.4;
array[1][1]=5.8;
array[2][0]=9.8;
array[2][1]=5.7;
array[3][0]=4.6;
array[3][1]=7.45698;
array[4][0]=1.22;
array[4][1]=3.1478;
}

private static double getAverage(){
int counter=0;
double sum = 0;
for(int i=0;i<array.length;i++){
for(int j=0;j<array[i].length;j++){
sum = sum+array[i][j];
counter++;
}
}

return sum / counter;
}
}
``````

Output:

``````5.452478000000001
``````
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