intstack.cpp

Thinking in C++, 2nd Edition, Volume 2. 英文doc版 每章源代码

//: C16:IntStack.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Simple integer stack
//{L} fibonacci
#include "fibonacci.h"
#include "../require.h"
#include <iostream>
using namespace std;

class IntStack {
  enum { ssize = 100 };
  int stack[ssize];
  int top;
public:
  IntStack() : top(0) {}
  void push(int i) {
    require(top < ssize, "Too many push()es");
    stack[top++] = i;
  }
  int pop() {
    require(top > 0, "Too many pop()s");
    return stack[--top];
  }
};

int main() {
  IntStack is;
  // Add some Fibonacci numbers, for interest:
  for(int i = 0; i < 20; i++)
    is.push(fibonacci(i));
  // Pop & print them:
  for(int k = 0; k < 20; k++)
    cout << is.pop() << endl;
} ///:~