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POint value jumps from 0 to 32679 without change
 

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  1. POint value jumps from 0 to 32679 without change
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    <p>I have a really, really weird problem that I just can't figure out. So you can have a look, here is my code;</p> <pre><code>point * findLongPaths(point * points, double threshold_distance) { int i = 0; int pointsAboveThreshold = countPointsAboveThreshold(points, threshold_distance); point * pointsByThreshold = new point[sizeof(points)]; pointValues * pointsToCalculate = new pointValues[pointsAboveThreshold]; //pointValues pointsToCalculate[pointsAboveThreshold]; //point orderedPoints[pointsAboveThreshold]; while (points[i].end != true) { point pointOne = points[i]; point pointTwo = points[i + 1]; //Check to see if the distance is greater than the threshold, if it is store in an array of pointValues double distance = distanceBetweenTwoPoints(pointOne, pointTwo); if (distance &gt; threshold_distance) { pointsToCalculate[i].originalLocation = i; pointsToCalculate[i].distance = distance; pointsToCalculate[i].final = pointTwo; //If the final point has been calculated, break the loop if (pointTwo.end == true) { pointsToCalculate[i].end = true; break; } else { pointsToCalculate[i].end = false; i++; } } else if (points[0].end == true || pointsAboveThreshold == 0) { //If there is no points above the threshold, return an empty point if (points[0].end == true) { point emptyPoint; emptyPoint.x = 0.0; emptyPoint.y = 0.0; emptyPoint.end = true; pointsByThreshold[0] = emptyPoint; return pointsByThreshold; } } i++; } i = 0; //Find the point with the lowest distance int locationToStore = 0; while (pointsToCalculate[i].end != true) { </code></pre> <p>My problem is, the i value literally goes from 0 to 32679. I originally had it set to j, so it was using a different counter to the one in the while loop before but I tried it with the <code>i</code> to see if it would make a difference.</p> <p>I have tried it in both VC++ and XCode and both are doing it. However, if I place a breakpoint a few lines before it, it stays as a zero. If I run it without any breakpoints, it changes the value to 32679. </p> <p>Why is this? It's really weird and I have no idea how to fix it?</p>
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    1. USPuppy
    1. USBrandon
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    1. COWhere do you `i` go up? (i suppose `i++` just inside the while-loop) Where did you put your breakpoint? It just looks like you points array has 32680 entries without any `end`-value set to true.
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      1. POint value jumps from 0 to 32679 without change
      1. USHoward
    2. COYeah, `i` is incremented in the while loop. I placed the breakpoint at the comment line `//Find the points with the lowest distance' and moved `i = 0` below the `int locationToStore = 0` line. Possibly, I will go have a look and see if I can find anything like that.
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      1. POint value jumps from 0 to 32679 without change
      1. USBrandon
    3. COYou are probably miscalculation the size of some array, and writing outside the allocated area. This for example `point * pointsByThreshold = new point[sizeof(points)];` allocates either 4 or 8 points depending on the size of a pointer. Probably not what was intended.
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      1. USBo Persson
 

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