（1）用顺序栈实现一个支持大整数的加法和减法计算功能的计算程序。

（2）实现创建顺序栈，入栈，出栈等基本操作，并使用这些基本操作协助完成大整数加法的实现。

（3）用if或switch语句设计一个如下页的选择式菜单。-(A) implement a stack with support for large sequential integer addition and subtraction calculations calculation program.

(2) in order to achieve the creation stack, stack, stack, and other basic operations, and assist in completing these basic operations using large integer addition implementation.

(3) with an if or switch statement to design a menu option on the following page.