c++类种类 创建&销毁 顺序

#include "line.h" #include "stdlib.h" /* 坐标类line包含2个点类 程序说明了类中类的创建销毁顺序 */ void main(){ line *p = new line(1, 2, 3, 4); delete p; p = NULL; system("pause"); } Dot::Dot()  1 2 Dot::Dot()  3 4 line ~line() Dot::~Dot()3 4 Dot::~Dot()1 2

class Dot{ public: Dot(int a,int b); ~Dot(); int getX(); int getY(); void setX(int setx); void setY(int sety); private: int x; int y; };	#include "Dot.h" class line{ public: line(int x1, int y1, int x2, int y2); ~line(); void setA(int a, int b); void setB(int a, int b); void printinfo(); private: Dot d1; Dot d2; };
#include "Dot.h" #include using namespace std; Dot::Dot(int a, int b) :x(a), y(b) { cout << "Dot::Dot() " <	#include "line.h" #include "iostream" using namespace std; line::line(int x1, int y1, int x2, int y2):d1(x1,y1),d2(x2,y2){ cout << "line"<