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POConway's Game of Life logic error
 

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    <p>I'm taking a class that uses C# and our first assignment is to implement Conway's game of Life. We must do this by reading in a text file formatted something like this:</p> <pre><code> * * *** *** </code></pre> <p>We then have to display the next 10 generations on the screen. I have the file read into a string array, then I copy it to another array. I then go through it character by character and change the copied array to match what the next generation should be. My problem is that the code I have to count the live neighbors isn't working and I can't figure out why. I displayed the number of live neighbors for each cell on the screen and about half of them are wrong. I know the error is occurring with cells on the edge of the "board," but I can't figure out how to fix it. </p> <p>Now, I don't want the whole thing written for me, that'd be a bit pointless. I just can't figure out where my logic is off. Any help would be appreciated. Also, I'm aware that my code is pretty poor, overall. This was just the only way I could figure it out. Sorry.</p> <pre><code> class Program { static void Main(string[] args) { //gets file name from command arguments //checks to make sure file exists, exits if file does not exist if (!File.Exists(Environment.GetCommandLineArgs()[1])) { System.Environment.Exit(1); } //gets file name from command arguments then reads file into array of strings string[] gen0 = File.ReadAllLines(Environment.GetCommandLineArgs()[1]); string[] gen1 = gen0; char alive = '*'; char dead = ' '; //displays first generation foreach (string s in gen0) { Console.WriteLine(s); } Console.WriteLine("====================================="); //counts live neighbors of a cell int count = 0; for (int i = 0; i &lt; gen0.Length; i++) { count = 0; for (int j = 0; j &lt; gen0[i].Length; j++) { //check top left neighbor if (i &gt; 0 &amp;&amp; j &gt; 0 &amp;&amp; j &lt; gen0[i-1].Length ) { if (gen0[i - 1][j - 1] == alive) { count++; } } //check above neighbor if (i &gt; 0 &amp;&amp; j &lt; gen0[i-1].Length) { if (gen0[i - 1][j] == alive) { count++; } } //check top right neighbor if (i &gt; 0 &amp;&amp; j + 1 &lt; gen0[i - 1].Length) { if (gen0[i - 1][j + 1] == alive) { count++; } } //check left neighbor if (j &gt; 0) { if (gen0[i][j - 1] == alive) { count++; } } //check right neighbor if (j + 1 &lt; gen0[i].Length) { if (gen0[i][j + 1] == alive) { count++; } } //check bottom left neighbor if (i + 1 &lt; gen0.Length &amp;&amp; j &gt; 0 &amp;&amp; j &lt; gen0[i+1].Length) { if (gen0[i + 1][j - 1] == alive) { count++; } } //check below neighbor if (i + 1 &lt; gen0.Length &amp;&amp; j &lt; gen0[i+1].Length) { if (gen0[i + 1][j] == alive) { count++; } } //check bottom right neighbor if (i + 1 &lt; gen0.Length &amp;&amp; j + 1 &lt; gen0[i].Length &amp;&amp; j + 1 &lt; gen0[i+1].Length) { if (gen0[i + 1][j + 1] == alive) { count++; } } //Console.WriteLine(count); //kills cells if (count &lt; 2 || count &gt; 3) { gen1[i] = gen1[i].Remove(j, 1); gen1[i] = gen1[i].Insert(j, dead.ToString()); } //births cells if (count == 3) { gen1[i] = gen1[i].Remove(j, 1); gen1[i] = gen1[i].Insert(j, alive.ToString()); } } } foreach (string s in gen1) { Console.WriteLine(s); } } } </code></pre>
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