18次试验有关栈的程序

//-------------------------------------
// Stack.h
//-------------------------------------
const int SIZE = 10;//size初始化为10
//-------------------------------------
class Stack{
  int stck[SIZE];      //holds the stack
  int tos;              //index of top-of-stack
public:
  Stack():tos(0){}//tos即栈的顶部初始化为0
  int top();
  void push(int ch);   //push integer to stack
  int pop();           //pop integer from stack.
};//-----------------------------------
 //-------------------------------------
// Stack.cpp
//-------------------------------------
#include"Stack.h"
#include<iostream>
//-------------------------------------
int Stack::top()//top(),push(),pop()
{
  return stck[tos-1];//无需判断
}//------------------------------------
void Stack::push(int ch){
  if(tos==SIZE)//只判断是否已满，进行判断
{
    std::cout<<"\nStack is full\n";
    return;
  }
  stck[tos++]=ch;//stck[tos++]=ch;
}//------------------------------------
int Stack::pop()
{
  if(tos==0){
    std::cout<<"\nStack is empty\n";
    return 0;  //return null on empty stack.
  }
  return stck[--tos];   //top of stack，如果最高一层为0，输出empty，如果不为0，返回他的下一个，使下一个数值为顶部
}//------------------------------------

//-------------------------------------
// EX0805.cpp
// 栈应用
//-------------------------------------
#include"Stack.h"
#include<iostream>
//-------------------------------------
int main(){
  Stack s;
  s.push(10);
  s.push(12);
  s.push(14);
  std::cout<<s.top()<<"\n";
  s.pop();
  std::cout<<s.top()<<"\n";
  system("pause");
}//------------------------------------