c++ - 变量未按要求存储

Question

这是我的代码:

point * findLongPaths(point * points, double threshold_distance) {
    unsigned int i = 0;
    int locationToStore = 0;
    int pointsAboveThreshold = countPointsAboveThreshold(points, threshold_distance);
    //int totalPoint = totalPoints(points);

    point * pointsByThreshold = new point[pointsAboveThreshold];
    pointValues * pointsToCalculate = new pointValues[pointsAboveThreshold];
    //pointValues pointsToCalculate[pointsAboveThreshold];
    //point orderedPoints[pointsAboveThreshold];

    while (points[i].end != true && i < pointsAboveThreshold) {
        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 > threshold_distance) {
            pointsToCalculate[i].originalLocation = i;
            pointsToCalculate[i].distance = distance;
            pointsToCalculate[i].final = pointTwo;
            pointsToCalculate[i].stored = false;

            //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++;
                continue;
            }
        } 
    }

    if (points[0].end == true && pointsAboveThreshold == 0) {
        point emptyPoint;
        emptyPoint.x = 0.0;
        emptyPoint.y = 0.0;
        emptyPoint.end = true;

        pointsByThreshold[0] = emptyPoint;
        return pointsByThreshold;
    }

    //Find the point with the lowest distance
    i = 1;
    //double lowest = 0.0;

    //EDITED
    pointValues pointWithLowest;
    pointWithLowest = pointsToCalculate[0];
    while (pointsToCalculate[i].end != true) {
        for (int j = 0; pointsToCalculate[j].end != true; j++) {
            if (pointsToCalculate[j].stored == true) {
                j++;
                continue;
            } else {
                if (pointsToCalculate[j].distance < pointWithLowest.distance) {
                    pointWithLowest = pointsToCalculate[j];
                    j++;
                    continue;
                } else if (pointsToCalculate[j].distance == pointWithLowest.distance) {
                    if (pointWithLowest.originalLocation > pointsToCalculate[j].originalLocation) {
                        pointWithLowest = pointsToCalculate[j];
                        j++;
                        continue;
                    }
                } else {
                    pointWithLowest.stored = true;
                    pointsByThreshold[locationToStore] = pointWithLowest.final;
                    locationToStore++;
                    break;
                }
            }
        }
        i++;
    }
    delete[] pointsToCalculate;
    return pointsByThreshold;
}

由于某些奇怪的原因，当我在 pointsToCalculate[i].originalLocation = i; 行中存储 i 时，它总是存储为 0。我运行了断点在它上面，它显示 i 的值在 while 循环中递增，但它仍在将 originalLocation 存储为 0。当我在运行时检查值时，它显示pointsToCalculate[i] 中的 i 是 1 或 2，这取决于我在循环中运行了多少次，它还显示那= i;也是1或2`，这取决于循环。

有人知道这是为什么吗？这是一项几个小时后到期的作业，我已经为此工作了很长时间。还是想不通。

谢谢，布兰登

Answer 1

如果distance <= threshold_distance ,i不会递增，while循环会一直循环