JuniorTheoryCommon

What does the program print?

JAVA

public class Main {
    public static void main(String[] args) {
        int[][] grid = new int[3][4];
        System.out.println(grid.length + " " + grid[0].length);
    }
}

3 4

Expecting 12 for grid.length: a 2D array is an array of rows, so grid.length is the number of rows, not of all cells.
Expecting 4 3: in new int[3][4] the first number is the rows and the second is the length of each row.

How do you count all the cells of grid with its two lengths?
Why is grid[i].length safer than grid[0].length in an inner loop?

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Back to questions

JuniorTheoryCommon

What does the program print?

JAVA

public class Main {
    public static void main(String[] args) {
        int[][] grid = new int[3][4];
        System.out.println(grid.length + " " + grid[0].length);
    }
}

3 4

Expecting 12 for grid.length: a 2D array is an array of rows, so grid.length is the number of rows, not of all cells.
Expecting 4 3: in new int[3][4] the first number is the rows and the second is the length of each row.

How do you count all the cells of grid with its two lengths?
Why is grid[i].length safer than grid[0].length in an inner loop?

Back to questions Open topic in roadmap →Answer it yourself — Quiz