A simple c++ class, Contain three file:
/*
* Tree.h
*
* Created on: Aug 23, 2009
* Author: sai
*/
#ifndef TREE_H_
#define TREE_H_
#include
using namespace std;
class Tree {
int height; // the tree's height
public:
Tree(int initialHeight);
virtual ~Tree();
void grow(int years);
void printsize();
/**
* over loade << operator like this:
* friend ostream& operator<< (ostream& os, const Tree& tree) const;
*
* got error:non-member function ‘std::ostream& operator<<(std::ostream&, const Tree&)’ cannot have cv-qualifier
*/
friend ostream& operator<< (ostream& os, const Tree& tree);
};
#endif /* TREE_H_ *//*
* Tree.cpp
*
* Created on: Aug 23, 2009
* Author: sai
*/
#include
#include "Tree.h"
using namespace std;
Tree::Tree(int initialHeight) {
height = initialHeight;
}
Tree::~Tree() {
// DO NOTHING
}
void Tree::grow(int years) {
height += years;
}
void Tree::printsize() {
cout << "Tree's height is :" << height;
}
ostream& operator<< (ostream& out, const Tree& tree){
out << "Tree's height is :" << tree.height;
return out;
}//============================================================================
// Name : welcome.cpp
// Author : sai
// Version :
// Copyright : copyright 2009, sai zeng
// Description : Hello World in C++, Ansi-style
//============================================================================
#include
#include "Tree.h"
using namespace std;
int main() {
cout << "Welcome CPP developer" << endl; // prints Welcome CPP developer
/** test class Tree*/
Tree r(30);
r.printsize();
cout << endl;
r.grow(23);
r.printsize();
cout << endl;
cout << r << endl;
return 0;
}
output:
Welcome CPP developer
Tree height is :30
Tree height is :53
Tree height is :53sai@
