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mystery2d2

Language/Type: Java 2D arrays array mystery
Author: Marty Stepp (on 2021/04/02)

Consider the following method: 

            public void mystery2(int[][] data, int pos, int rows, int cols) {
                for (int i = 0; i < rows; i++) {
                    int sum = 0;
                    for (int j = 0; j < cols; j++) {
                        sum = sum + data[pos + i][pos + j];
                    }
                    System.out.print(sum + " ");
                }
                System.out.println();
            }

Suppose that a variable called grid has been declared as follows: 

           int[][] grid = {{4, 6, 8, 8, 2, 1}, {7, 4, 8, 8, 7, 7},
                           {7, 8, 6, 6, 7, 2}, {1, 2, 2, 7, 5, 7},
                           {8, 3, 6, 6, 1, 1}, {9, 7, 9, 6, 6, 1}};

which means it will store the following 6-by-6 grid of values: 

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

For each call below, indicate what output is produced:

mystery2(grid, 0, 2, 2);
mystery2(grid, 2, 3, 2);
mystery2(grid, 1, 4, 1);

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