说明：  纯c下一般用链表实现内存的动态分配，有点麻烦，而且容易出错，为了方便实用，这里尝试写了一个在用c写的动态分配内存的console程序，例子实现的是可以动态分配二维数组的大小。
(Under the general use of pure c List realize the dynamic allocation of memory, a bit of trouble, but also prone to error, in order to facilitate the practical, here trying to write a c write using the dynamic allocation of memory console program, for example, is that it can realize the dynamic allocation of the Second dimensional array size.)