C++ 构造函数和析构函数

/* class constructor && desctructor */

#include <iostream>

using namespace std;

class Line {

private :

int length;

int points;

public:

/* constructor */

Line(int len, int pns);

/* destructor */

~Line(void);

void setLength(int len);

int getLength();

void setPoints(int len);

int getPoints();

};

#if 1

Line::Line(int len,int pns)

{

cout << "constrctor" << endl;

this->length = len;

this->points = pns;

}

#else

Line::Line(int len, int pns) : length(len), points(pns)

{

}

#endif

Line::~Line()

{

cout << "Destructor!" << endl;

}

void Line::setLength(int len)

{

length = len;

}

int Line::getLength()

{

return length;

}

void Line::setPoints(int p)

{

points = p;

}

int Line::getPoints()

{

return points;

}

int main()

{

Line l(10,11);

cout << "length: " << l.getLength() << endl;

cout << "points: " << l.getPoints() << endl;

cout << endl << "after set methods" << endl;

l.setLength(20);

l.setPoints(21);

cout << "length: " << l.getLength() << endl;

cout << "points: " << l.getPoints() << endl;

return 0;

}