any hints?

Question about the task

2048 (Part 5/18)

Games, Level 0, Lesson 2

Under discussion

any hints as to why it doesn't like my number assignment?

According to the rules, when you start a game, the values of two random cells must be 2 or 4 (with a probability of 90% and 10%, respectively).

To satisfy this requirement, create a createNewNumber() method and call it twice in the createGame() method.

The createNewNumber() method:

1) selects a random cell whose value is 0 in the gameField matrix.

Hint: A "random cell" is a cell with random coordinates. To get a random x coordinate, you need to use a random number between 0 and SIZE. This can be done by calling the getRandomNumber(int) method with SIDE as the argument. For the y coordinate, you need to do something similar. After getting the coordinates, you need to check the cell value and, if it is not 0, then repeat the search for a random cell until you find one whose value is 0;

2) randomly assigns a value of 2 (probability of 90%) or 4 (probability of 10%).

Hint: use the getRandomNumber(int) method with 10 as the argument:

The getRandomNumber(10) method returns a random number between 0 and 9. So it will return the number 9 with a probability of 10%.

- if getRandomNumber(10) returns the number 9, the cell should be assigned the value 4;
- if getRandomNumber(10) returns a number between 0 and 8, the cell should be assigned the value 2.

Requirements:

A private void createNewNumber() method must be created in the Game2048 class.
The createNewNumber() method should call getRandomNumber(SIDE) twice and getRandomNumber(10) once.
The createNewNumber() method must assign a new value of 2 or 4 (with a probability of 90% and 10%, respectively) to a random empty cell in the gameField matrix.
The createGame() method must call the createNewNumber() method twice.

package com.codegym.games.game2048; import com.codegym.engine.cell.*; public class Game2048 extends Game{ private static final int SIDE = 4; private int[][] gameField = new int[SIDE][SIDE]; @Override public void initialize(){ setScreenSize(SIDE, SIDE); createGame(); drawScene(); } private void createGame(){ createNewNumber(); createNewNumber(); } private void drawScene(){ for (int x=0; x<SIDE; x++){ for (int y=0; y<SIDE; y++){ setCellColor(x, y, Color.BLUE); } } } //doesn't meet 3rd requirement below private void createNewNumber(){ int x; int y; int value = 0; x = getRandomNumber(SIDE); y = getRandomNumber(SIDE); if (gameField[x][y]!=0){ createNewNumber(); }else { int z = getRandomNumber(10); if (z<8){ gameField[y][x] = 2; } else if (z==9){ gameField[y][x] = 4; } } } }

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Pascal Wetzel

Level 0 , Germany

25 March 2022, 08:25

First of, you have to change

if (z<8)

if (z<=8)

. Then you need to flip x and y in

gameField[y][x] = 2;

and

gameField[y][x] = 4;

. Then it works.