说明：  用类实现大数的数据结构算法，可以比较两个大数的大小，两个大数间相加，大数与普通整数相加，两个大数相乘等
(Large numbers with the class implements the data structure algorithms, can compare the size of two large numbers, between the sum of two large numbers, large numbers of ordinary integer add, multiply two large numbers, etc.)