本次程序设计是对于计算机中超过整型数范围的整数，要解决这类数的存储和运算，用单链表进行存储，同时这个大整数的类要实现4个功能：输入、输出、加法和赋值。-This program is designed for computer over the range of integer integer numbers to solve this kind of storage and computing, a single linked list for storage, while the large