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PO(VC2010 express) 2D array misbehaving
 

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  1. PO(VC2010 express) 2D array misbehaving
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    <p>Im using VC2010 express and am encountering an result I can't quite grasp. My code is as follows:</p> <pre><code>// #include "stdafx.h" #include &lt;iostream&gt; #include &lt;time.h&gt; using namespace std; void main() { const int gridSize = 2; int grid[gridSize][gridSize]; for(int x=1; x &lt;= gridSize; x++){ for(int y=1; y &lt;= gridSize; y++){ grid[x][y] = 0; } } for(int i=0; i &lt;= gridSize; i++){ grid[i][0] = 1; // set the horizontal line to 1's grid[0][i] = 1; // set the vertical line to 1's } int rows = 0; while(rows &lt;= gridSize){ for(int i=0; i&lt;=gridSize; i++){ cout &lt;&lt; grid[i][rows] &lt;&lt; " "; } cout &lt;&lt; "\n"; rows++; } clock_t wait; wait = clock(); while (clock() &lt;= (wait + 500000)); // Wait for 500 seconds and then continue wait=0; } </code></pre> <p>I am expecting this code to result in:</p> <ul> <li>1 1 1</li> <li>1 0 0</li> <li>1 0 0</li> </ul> <p>Instead it results in:</p> <ul> <li>1 1 1</li> <li>1 0 0</li> <li>1 1 0</li> </ul> <p>I dont understand how its possible for this code to fill grid[1][2] with 1. Any thoughts on that?</p> <p><strong>EDIT:</strong> Can't answer my own question right now.. But I've solved the lattice paths problem! :) Ended up with this code to calculate the amount of lattice paths in a grid:</p> <pre><code>#include "stdafx.h" #include &lt;iostream&gt; #include &lt;time.h&gt; using namespace std; void main() { const int gridSize = 3; int grid[gridSize+1][gridSize+1]; for(int i=0; i &lt;= gridSize; i++){ grid[i][0] = 1; // set the horizontal line to 1's grid[0][i] = 1; // set the vertical line to 1's } for(int x=1; x &lt;= gridSize; x++){ for(int y=1; y &lt;= gridSize; y++){ grid[x][y] = grid[x-1][y] + grid[x][y-1]; } } cout &lt;&lt; "Amount of lattice paths for a " &lt;&lt; gridSize &lt;&lt; "x" &lt;&lt; gridSize &lt;&lt; " grid: " &lt;&lt; grid[gridSize][gridSize]; clock_t wait; wait = clock(); while (clock() &lt;= (wait + 500000)); // Wait for 500 seconds and then continue wait=0; } </code></pre> <p>Thanks for the quick reply :)</p>
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    1. USPwnball
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    1. CO`i<=gridSize` in the for loop - instant UB! You don't even have to pay for it!
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    2. COJust start your day with a debugger :)
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      1. PO(VC2010 express) 2D array misbehaving
      1. US0decimal0
 

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