How to iterate through columns [rows] of a multi dimensional array

Question

I am using a multi-dimensional array to store the total amount of product sold (products range 1 to 5) by a particular salesperson (1 to 4 salespersons).

T arranged

Answer 1

To iterate over a single row k in a two-dimensional array:

for (int j = 0; j < multiarray[k].length; j++)
    multiarray[k][j]; // do something

And to iterate over a single column k in a two-dimensional array:

for (int i = 0; i < multiarray.length; i++)
    multiarray[i][k]; // do something

Answer 2

Lets say you have a two dimensional array as

int[][] salesData={{13, 23, 45, 67, 56},
                                {43, 65, 76, 89, 90},
                                {43, 45, 76, 98, 90},
                                {34, 56, 76, 43, 87}};

so it is a 4*5 matrix

int[0] represents the the 1st row i.e the {13, 23, 45, 67, 56} if you need the value in individual cell you need to iterate 2 for each loop like

    for (int[] rowData: salesData){
                for(int cellData: rowData)
                {
System.out.printn("the indiviual data is" +cellData);
                }
            }

Answer 3

First off, don't use all your code if it's not needed. You only need the declaration and maybe one for-loop.

Loop through columns:

for(int i=0; i<monthlySales[salesPerson].length; i++) {
    monthlySales[i][salesPerson]; //do something with it!
}

Answer 4

Got it:) Bit of a headwreck trying to visualise the array but got there eventually, cheers for the help

//loop thorugh each column to get total products sold
    for (int product = 0; product < salesTotals[0].length; product++) {
        int totalProduct = 0;
        for (int salePerson = 0; salePerson < salesTotals.length; salePerson++) {

            totalProduct += salesTotals[salePerson][product];

        }//end inner for
        System.out.printf("%10d", totalProduct);

    }//end outer for