//  this program uses several functions with 2D arrays as parameters

public class ArrayParm {
    public static void main(String[] args) {

//    create a rectangular array, fill it with values, and print it

        int[][] nums = new int[5][6];
        fill(nums);
        display(nums);
        System.out.println();

//    create a lower triangular array and print it

        int[][] lower = new int[5][];
        for (int i = 0 ; i < 5 ; i++) 
            lower[i] = new int[i+1];
        fill(lower);
        display(lower);
    }

//    store a value in each location of a 2D array
//    works for any 2D array, even if the rows are not the same size

    public static void fill(int[][] nums) {
        for (int i = 0 ; i < nums.length ; i++)
            for (int j = 0 ; j < nums[i].length ; j++)
                nums[i][j] = (i + j + 1);
    }

//    print a 2D array
//    works for any 2D array, even if the rows are not the same size

    public static void display(int[][] arr) {
        for (int i = 0 ; i < arr.length ; i++) {
            for (int j = 0 ; j < arr[i].length ; j++)
                System.out.print(arr[i][j] + "    ");
            System.out.println();
        }
    }
}

1    2    3    4    5    6
2    3    4    5    6    7
3    4    5    6    7    8
4    5    6    7    8    9
5    6    7    8    9    10

1
2    3
3    4    5
4    5    6    7
5    6    7    8    9

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