How do we do sum of indexes in a 2D array-CodePudding

I have a 2D array where rows = 3 and columns = 2. I want to get a sum of all the indices. Here is my array.

arr[][] = [1, 2], [3, 4], [5, 6]

Row 1

At index (0, 0) the sum of indexes becomes (0 0 = 0)

At index (0, 1) the sum of indexes becomes (0 1 = 1)
Row 2

At index (1, 0) the sum of indexes becomes (1 0 = 1)

At index (1,1) the sum of indexes becomes (1 1 = 2)
Row 3

At index (2, 0) the sum of indexes becomes (2 0 = 2)

At index (2, 1) the sum of indexes becomes (2 1 = 3)

My expected output becomes

0 1 1 2 2 3

I am unable to find any resource, how to do this

CodePudding user response：

You have to do sum of column and row using for loop or any other loop.

import java.util.*;
public class Main    
{    
    public static void main(String[] args) {    
        int rows, cols, sumIndex = 0;    
            
        int a[][] = {       
                        {1, 2},    
                        {3, 4},    
                        {5, 6}    
                    };
                    
        rows = a.length;    
        cols = a[0].length;    
                    
        for(int i = 0; i < rows; i  ){    
            for(int j = 0; j < cols; j  ){    
              sumIndex = i   j;
              System.out.print(sumIndex   " ");
            }    
        }   
    }    
}

CodePudding user response：

Another quick example:

import java.util.*;
class Main {

  public static void main(String[] args) {       
    int[][] arr = new int[3][2];
    for(int row=0; row<arr.length; row  ) {
      for(int col=0; col<arr[row].length; col  ) {
        arr[row][col] = row   col;
      }
    }

    for(int[] row : arr) {
      System.out.println(Arrays.toString(row));
    }
  }
 
}

Output:

[0, 1]
[1, 2]
[2, 3]