原创 帮忙找bug

谁能找的出下面这个函数的bug么？

int findData(int a[], int array_len, int target)
{
            int low = 0;
            int high = array_len - 1;
            while(low <= high)
            {
                        int mid = (low+high)/2;
                        int value = a[mid];
                        if(target < value)
                                    high－－;
                            else if(target > value)
                                       low++;
                              else
                                    return mid;
            }
            return -1;
}