.本演示程序中，利用双向循环链表实现长整数的存储，每个结点含一个整型变量任何整型变量的范围是-（215-1）—（215-1）。在每个结点中仅存十进制数的4位，即不超过9999的非负整数，整个链表表示为万进制数。输入和输出形式按中国对于长整数的习惯，每四位一组，组间用逗号隔开。-The demonstration program, the use of two-way circular linked list to achieve long integer storage, each node contains an integer variable range is any integer variable- (215-1)- (215-1). At each node in the remaining four decimal numbers, that is no more than 9999 non-negative integer, the entire list is represented as Wan decimal. Input and output forms by Chinese habits for long integers, each group of four between the two groups separated by commas.