Mini Sudoku game 4x4 ( four 2x2 grids) program

**derky** · September 16th, 2009, 05:20 AM

Hello guys and girls,
I'm doing this assignment and it involves making a mini sudoku game 4x4 ( four 2x2 grids) and the user enters 5 numbers into the board and starts solving it. Also we are not allowed to use arrays for this task.

I've been trying to write the code up and this is what I have come up with.

import java.util.Scanner;
public class Main
{
    public static final Scanner keyboard = new Scanner(System.in);
    public static void main(String[] args)
    {        
        int n = 1;
 
        Sudoku board = new Sudoku();
        System.out.println("Configure puzzle");
        System.out.print("Region: "); 
        int region = keyboard.nextInt();
        System.out.print("Cell: "); 
        int cell = keyboard.nextInt();
        System.out.print("Number: "); 
        int number = keyboard.nextInt();
        board.enterNumber(region, cell, number, true);
        board.print();
 
        while (n < 5){
            System.out.print("Region: "); 
            region = keyboard.nextInt();
            System.out.print("Cell: "); 
            cell = keyboard.nextInt();
            System.out.print("Number: "); 
            number = keyboard.nextInt();
            board.enterNumber(region, cell, number,true);
            board.print();
            n += 1;
        }
 
        System.out.println("Puzzle entered. Time to solve!");         
 
        int p = 1;       
        while (p < 13){
            System.out.print("Region: "); 
            region = keyboard.nextInt();
            System.out.print("Cell: "); 
            cell = keyboard.nextInt();
            System.out.print("Number: "); 
            number = keyboard.nextInt();
            board.enterNumber(region, cell, number,false);
            board.print();
            p += 1;
 
        }
    }
}

and

public class Sudoku
{
    private int a1,a2,a3,a4,b1,b2,b3,b4,c1,c2,c3,c4,d1,d2,d3,d4;
 
    public Sudoku()
    {
 
    }
 
    public void enterNumber(int region, int cell, int number, boolean lock)
        {
            {
            switch (region){
                case 1:
                    if (cell == 1){
                        a1 = number;
                    }else if (cell == 2){
                        a2 = number;
                    }else if (cell == 3){
                        a3 = number;
                    }else if (cell == 4){
                        a4 = number;
                    }
                    break;
 
                case 2:
                    if (cell == 1){
                        b1 = number;
                    }else if (cell == 2){
                        b2 = number;
                    }else if (cell == 3){
                        b3 = number;
                    }else if (cell == 4){
                        b4 = number;
                    }
                    break;
 
                case 3:
                    if (cell == 1){
                        c1 = number;
                    }else if (cell == 2){
                        c2 = number;
                    }else if (cell == 3){
                        c3 = number;
                    }else if (cell == 4){
                        c4 = number;
                    }
                    break;
 
                case 4:
                    if (cell == 1){
                        d1 = number;
                    }else if (cell == 2){
                        d2 = number;
                    }else if (cell == 3){
                        d3 = number;
                    }else if (cell == 4){
                        d4 = number;
                    }
                    break;
 
        }
    }
}
 
 
 
 
    public void print()
    {
        System.out.println();
        System.out.println(+ a1 + " " + a2 + " " + b1 + " " + b2);
        System.out.println(+ a3 + " " + a4 + " " + b3 + " " + b4);
        System.out.println(+ c1 + " " + c2 + " " + d1 + " " + d2);
        System.out.println(+ c3 + " " + c4 + " " + d3 + " " + d4);
        System.out.println();
    }
}

Basically it's working to an extent but I am unsure about a few things.

1. The task requires me to print out blank spaces " " instead of 0's for spots that don't have a value yet. ( The teacher gave us a hint of making all of them -1 but I'm not sure how that helps me)

2. I used boolean lock to try lock in the first 5 entries the user inputs when they configure the board. However, when I input a new number to one of the initial spots, the original entry gets overwritten.

Sorry for the wall of text. Any help/advice would be appreicated.
Thanks

**Freaky Chris** · September 16th, 2009, 05:51 AM

public class Sudoku
{
    private int a1,a2,a3,a4,b1,b2,b3,b4,c1,c2,c3,c4,d1,d2,d3,d4;
 
    public Sudoku()
    {
 
    }
 
    public void enterNumber(int region, int cell, int number, boolean lock)
        {
            {
            switch (region){
                case 1:
                    if (cell == 1){
                        a1 = number;
                    }else if (cell == 2){
                        a2 = number;
                    }else if (cell == 3){
                        a3 = number;
                    }else if (cell == 4){
                        a4 = number;
                    }
                    break;
 
                case 2:
                    if (cell == 1){
                        b1 = number;
                    }else if (cell == 2){
                        b2 = number;
                    }else if (cell == 3){
                        b3 = number;
                    }else if (cell == 4){
                        b4 = number;
                    }
                    break;
 
                case 3:
                    if (cell == 1){
                        c1 = number;
                    }else if (cell == 2){
                        c2 = number;
                    }else if (cell == 3){
                        c3 = number;
                    }else if (cell == 4){
                        c4 = number;
                    }
                    break;
 
                case 4:
                    if (cell == 1){
                        d1 = number;
                    }else if (cell == 2){
                        d2 = number;
                    }else if (cell == 3){
                        d3 = number;
                    }else if (cell == 4){
                        d4 = number;
                    }
                    break;
 
        }
    }
}
 
 
 
 
    public void print()
    {
        System.out.println();
        System.out.println(Space(a1) + " " + Space(a2) + " " + Space(b1) + " " + Space(b2));
        System.out.println(Space(a3) + " " + Space(a4) + " " + Space(b3) + " " + Space(b4));
        System.out.println(Space(c1) + " " + Space(c2) + " " + Space(d1) + " " + Space(d2));
        System.out.println(Space(c3) + " " + Space(c4) + " " + Space(d3) + " " + Space(d4));
        System.out.println();
    }
 
    public String Space(int n){
        return n == 0 ? " " : new Integer(n).toString();
    }
}

Something like that might do it

Chris

**derky** · September 16th, 2009, 06:09 AM

Thanks for your quick help, Chris! (for cleaning up my post as well)

Am I doing something wrong with the boolean lock in my enterNumber method?
The first 5 entries is entered as true and the ones following that is false. I've never used it before so I'm kinda lost if thats the right logic/syntax.

**Freaky Chris** · September 16th, 2009, 06:13 AM

Sorry, I'm a bit confused by your second problem. Do you think you could explain again, perhaps provide some examples

Thanks,
Chris

**derky** · September 16th, 2009, 06:23 AM

Oh sure. Basically my program prompts the user to input the region, then the cell number of that region and then the number you want to put into that cell. The program requires the user to put in 5 numbers in different cells to create a starting point for the game. From there, the user continues to input numbers to different cells to try and fill in the blanks. Once the board is solved, a message will pop up saying Solved! or something like that.

For example:
Region 1
Cell 2
Number 3

Imagine there are 4 boxes and each of them is a 2x2 grid
the cells go in the order of
12
34

so this would put a number 3 in cell 2 of the first top left grid.

Now the problem is, I cannot make the first 5 inputs stay.

So a problem would be,

I put in
Region 1
Cell 2
Number 4

This would replace the previous 3 with the 4. But I want the 3 to be unchangable since it was one of the first 5 inputs.

I hope this is easier to understand :S

**Freaky Chris** · September 16th, 2009, 06:41 AM

Ah yes that makes perfect sense now thank you.

public class Sudoku
{
    private int a1,a2,a3,a4,b1,b2,b3,b4,c1,c2,c3,c4,d1,d2,d3,d4;
    private String originalCell = "";
    private String originalRegion = "";
    public Sudoku()
    {
 
    }
 
    public void enterNumber(int region, int cell, int number, boolean lock)
        {
            if(lock){
                 originalCell += cell;
                 originalRegion += region;
            }
           if(originalCell.indexOf(new Integer(cell).toString()) == originalRegion.indexOf(new Integer(region).toString()) &&  originalCell.indexOf(new Integer(cell).toString()) != -1){
            switch (region){
                case 1:
                    if (cell == 1){
                        a1 = number;
                    }else if (cell == 2){
                        a2 = number;
                    }else if (cell == 3){
                        a3 = number;
                    }else if (cell == 4){
                        a4 = number;
                    }
                    break;
 
                case 2:
                    if (cell == 1){
                        b1 = number;
                    }else if (cell == 2){
                        b2 = number;
                    }else if (cell == 3){
                        b3 = number;
                    }else if (cell == 4){
                        b4 = number;
                    }
                    break;
 
                case 3:
                    if (cell == 1){
                        c1 = number;
                    }else if (cell == 2){
                        c2 = number;
                    }else if (cell == 3){
                        c3 = number;
                    }else if (cell == 4){
                        c4 = number;
                    }
                    break;
 
                case 4:
                    if (cell == 1){
                        d1 = number;
                    }else if (cell == 2){
                        d2 = number;
                    }else if (cell == 3){
                        d3 = number;
                    }else if (cell == 4){
                        d4 = number;
                    }
                    break;
 
        }
    }
}
 
 
 
 
    public void print()
    {
        System.out.println();
        System.out.println(Space(a1) + " " + Space(a2) + " " + Space(b1) + " " + Space(b2));
        System.out.println(Space(a3) + " " + Space(a4) + " " + Space(b3) + " " + Space(b4));
        System.out.println(Space(c1) + " " + Space(c2) + " " + Space(d1) + " " + Space(d2));
        System.out.println(Space(c3) + " " + Space(c4) + " " + Space(d3) + " " + Space(d4));
        System.out.println();
    }
 
    public String Space(int n){
        return n == 0 ? " " : new Integer(n).toString();
    }
}

Something like that?

Chris

**derky** · September 16th, 2009, 07:39 AM

I just tried running with what you had there but when I try to input a number to a region but different cell it does not show up on the board.

For example:

I'm going to use 0's here because spaces dont show up :S

Region 1
Cell 1
Number 1

Region 2
Cell 2
Number 2

Region 3
Cell 3
Number 3

Region 4
Cell 4
Number 4

Region 1
Cell 4
Number 2

would give me
1002
0000
0000
3004 for my board. (the 5th input doesnt show up)

And then the "Puzzle entered. Time to solve!" comes up
and anything I input does not show up. ><

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