用数组存储大数，数据结构的一个小例子，当初课程设计时候写的，应该可以运行，记得当初写的时候有很难写，现在想想还可以 -A small example of the array of storage of large numbers, data structures, the original curriculum design when written, should be able to run, I remember when he started writing when it is difficult to write, and now think also can I