example28.cpp

来自「Advanced Internet Programming Lecture 2 」· C++ 代码 · 共 69 行

#include <iostream>
using namespace std;

const int SIZE = 10;

// Create a generic stack class
template <class StackType> class stack {
  StackType stck[SIZE]; // holds the stack
  int tos; // index of top-of-stack

public:
  stack() { tos = 0; } // initialize stack
  void push(StackType ob); // push object on stack
  StackType pop(); // pop object from stack
};

// Push an object.
template <class StackType> void stack<StackType>::push(StackType ob)
{
  if(tos==SIZE) {
    cout << "Stack is full.\n";
    return;
  }
  stck[tos] = ob;
  tos++;
}
// Pop an object.
template <class StackType> StackType stack<StackType>::pop()
{
  if(tos==0) {
    cout << "Stack is empty.\n";
    return 0; // return null on empty stack
  }
  tos--;
  return stck[tos];
}
int main()
{
  // Demonstrate character stacks.
  stack<char> s1, s2;  // create two character stacks
  int i;

  s1.push('a');
  s2.push('x');
  s1.push('b');
  s2.push('y');
  s1.push('c');
  s2.push('z');

  for(i=0; i<3; i++) cout << "Pop s1: " << s1.pop() << "\n";
  for(i=0; i<3; i++) cout << "Pop s2: " << s2.pop() << "\n";

  // demonstrate double stacks
  stack<double> ds1, ds2;  // create two double stacks

  ds1.push(1.1);
  ds2.push(2.2);
  ds1.push(3.3);
  ds2.push(4.4);
  ds1.push(5.5);
  ds2.push(6.6);

  for(i=0; i<3; i++) cout << "Pop ds1: " << ds1.pop() << "\n";
  for(i=0; i<3; i++) cout << "Pop ds2: " << ds2.pop() << "\n";

  return 0;
}