用链表实现栈的操作.该程序有栈的进栈和出栈操作.很简单.这是本人第一次上传程序源代码,如有什么不足之处还望各位多多海涵.-used to achieve stack operation. The program is the stack into the stack and stack up operation. Very simple. This is the first time I uploaded the source code, if there are any deficiencie