二分查找

int bsearchWithoutRecursion(int array[], int low, int high, int target)
{
    while(low <= high)
    {
        int mid = (low + high)/2;
        if (array[mid] > target)
            high = mid - 1;
        else if (array[mid] < target)
            low = mid + 1;
        else //find the target
            return mid;
    }
    //the array does not contain the target
    return -1;
}