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POCreating Pascal's Triangle (Unstable Code)
 

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    <p>There are two questions concerning the code posted below:<br/><br/> &nbsp;&nbsp;&nbsp;&nbsp;1) When I run this code on CodeBlocks, the code sometimes successfully runs (returning 0) but usually results in an error after it shows all the results (returning -1073741819). Why is this the case?<br/><br/> &nbsp;&nbsp;&nbsp;&nbsp;2) The values are all correct except for the last element of the array where the value should be 1 (pTriangle[20] = 1). However, I am getting some garbage number at the end, what am I doing wrong? <br/><br/> I have realized I could arrive at the same result with binomial coefficients but I still have no idea why I am getting the error and it'd be best if my mistake can be found. <br/><br/> <strong>Update1</strong>: <br/> <code>pTriangle[i] = temp[i % 2 ? 0 : 1] + pTriangle[i];</code> seems to be the problem. When I have commented this code, the program did not crash. I am trying to find out why it is crashing and trying to find a solution around it :)</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #define LEVEL 20 int main() { int *pTriangle = (int*)malloc(sizeof(int)*(LEVEL+1)); int i; for (i = 0; i &lt; LEVEL; i++) pTriangle[i] = 0; createPascalTriangle(pTriangle, LEVEL); for(i = 0; i &lt; LEVEL+1; i++) printf("pTriangle[%d]: %d\n", i, pTriangle[i]); free(pTriangle); return 0; } int createPascalTriangle(int *pTriangle, int level){ if (level &lt;= 0) return 0; pTriangle[0] = 1; pTriangle[1] = 1; int i; for ( i = 2; i &lt;= level; i++) increasePascalTriangleOneLevel(pTriangle); return 1; } int increasePascalTriangleOneLevel(int *pTriangle){ int i = 1; int temp[2] = {0}; temp[0] = pTriangle[0]; while (pTriangle[i] != 0){ temp[i % 2] = pTriangle[i]; pTriangle[i] = temp[i % 2 ? 0 : 1] + pTriangle[i]; i++; } pTriangle[i] = 1; return 1; } </code></pre>
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    1. COWow. It's indented!
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    2. COAha. Thank you :)
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