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POSudoku - Region testing
 

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    <p>I'm creating a sudoku generator, using a 'brute-force' randomity approach. I have been able to check the x / y axis for duplicate numbers just fine using the code:</p> <pre><code>for(l=0; l&lt;9; l++){//Makes all vertical work. if(sudoku[l][j] == temp){ isUsed=true; } } for(m=0; m&lt;9; m++){//makes all horizontal work if(sudoku[i][m] == temp){ isUsed=true; } } </code></pre> <p>I decided to implement the 'box' or 'region' checking (where you check every 3x3 square from the origin) and I just can't seem to wrap my head around the code. Here's what I've done so far. I just can't quite figure out where my logic error lies (for the record the program will run with this code, but will not check regions properly)</p> <pre><code>rowbase = i-(i%3); if(i==2 || i==5 || i==8 ){ if(rowbase == 0 || rowbase == 3 || rowbase == 6){ isUsed= RegionCheck.RegCheck(rowbase, sudoku); } } </code></pre> <p>Contents of regionCheck.java:</p> <pre><code> boolean okay = false; int[] regionUsed = new int[9]; int i=0, j=0, regionTester=0, counter=0, numcount; for (i=regionTester; i&lt;regionTester+3; i++){ for (; j&lt;3; j++){ regionUsed[counter]=sudoku[i][j]; counter++; } } for(i=0; i&lt;9; i++){ numcount=regionUsed[i]; for(j=0; j&lt;9; j++){ if(j==i){ //null } else if(numcount == regionUsed[j]){ okay=false; } } } return okay; </code></pre> <p>Somewhere along the way I'm just getting lost and not understanding how to 'select' a region and iterate through regions. </p> <p>Full source here: <a href="http://ideone.com/FYLwm" rel="nofollow">http://ideone.com/FYLwm</a></p> <p>Any help on simply how to 'select' a region for testing and then iterate through it would be greatly appreciated as I'm really out of ideas.</p>
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    1. COpossible duplicate of [Creating a Sudoku in Java](http://stackoverflow.com/questions/4477288/creating-a-sudoku-in-java)
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