seems im printing the right output but its not validated , any clue ?

Question about the task

Under discussion

package en.codegym.task.jdk13.task06.task0634;

import java.util.Scanner;

/*
Chess board
*/

public class Solution {
    public static char[][] array;

    public static void main(String[] args) {
        //write your code here
        Scanner scanner = new Scanner(System.in);
        //System.out.println("please Enter a number :");
        int input = scanner.nextInt();
        //System.out.println(input);

        array = new char[input][input];

        int len = array.length;
        boolean val1 = true;

        for (int i = 0; i < len; i++) {

            for (int j = 0; j < len; j++) {


                // here the logic
                if (val1) {
                    if (((i + 1) % 2 != 0) && ((j + 1) % 2 != 0)) {
                        array[i][j] = '#';
                    }
                } else {
                    if (((i + 1) % 2 == 0) && ((j + 1) % 2 == 0)) {
                        array[i][j] = '#';
                    }
                }


            }
            val1 = !val1;

        }

        for (int i = 0; i < len; i++) {
            for (int j = 0; j < len; j++) {
                System.out.print(array[i][j]);
            }
            System.out.println();
        }

    }
}

Let's create a program to generate square chessboards with a given dimension.
In the Solution class, you have a two-dimensional array of characters (the array field). Requirements:

Read a number from the keyboard. This will be the dimension of our board (the length of a side);
Initialize the array variable with the appropriate value;
"Paint" the array to obtain a checkerboard pattern (black cells - '#', white - ' '). Start the pattern by putting a '#' in the top left corner of the array;
Display the array on the screen as in the example (each row on a separate line).

Example output for number 5:
# # # # # # # # # # # # #

Requirements:

The program needs to read a number from the keyboard.
The array field must be initialized with an appropriately-sized array.
The array must be filled as outlined in the task conditions.
The program needs to display the elements of the array on the screen (see the example in the task conditions).

package en.codegym.task.jdk13.task06.task0634; import java.util.Scanner; /* Chess board */ public class Solution { public static char[][] array; public static void main(String[] args) { //write your code here Scanner scanner = new Scanner(System.in); //System.out.println("please Enter a number :"); int input = scanner.nextInt(); //System.out.println(input); array = new char[input][input]; int len = array.length; boolean val1 = true; for (int i = 0; i < len; i++) { for (int j = 0; j < len; j++) { // here the logic if (val1) { if (((i + 1) % 2 != 0) && ((j + 1) % 2 != 0)) { array[i][j] = '#'; } } else { if (((i + 1) % 2 == 0) && ((j + 1) % 2 == 0)) { array[i][j] = '#'; } } } val1 = !val1; } for (int i = 0; i < len; i++) { for (int j = 0; j < len; j++) { System.out.print(array[i][j]); } System.out.println(); } } }

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Thomas

Level 41 , Bayreuth, Germany

29 December 2023, 15:43

A char array as well as an int array by default is initialized with zeros for each element. The difference is, that a char interpretes that value different. 0 is interpreted as NUL and eg. 65 as A (search ASCII table on google). So when you print that NUL character Java prints some control character as this is (like a lot of chars up to dec 31) an unprintable char while CodeGym probably expects a space character (decimal int value 32). Just try it:

char cNUL  = 0;
System.out.println("'" + cNUL  + "'");
char cSpace = 32; // or ' '
System.out.println("'" + cSpace + "'");