constr1.cpp

来自「Thinking_in_C___2.rar」· C++ 代码 · 共 47 行

//: C06:Constr1.cpp
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Constructors & destructors
#include <cstdio>
using namespace std;

class Tree {
  int height;
public:
  Tree(int initialHeight);  // Constructor
  ~Tree();  // Destructor
  void grow(int years);
  void printsize();
};

Tree::Tree(int initialHeight) {
  height = initialHeight;
}

Tree::~Tree() {
  puts("inside Tree destructor");
  printsize();
}

void Tree::grow(int years) {
  height += years;
}

void Tree::printsize() {
  printf("Tree height is %d\n", height);
}

int main() {
  puts("before opening brace");
  {
    Tree t(12);
    puts("after Tree creation");
    t.printsize();
    t.grow(4);
    puts("before closing brace");
  }
  puts("after closing brace");
} ///:~