07.new和delete的例题.doc

***************************************************************** # include iostream.h //创建和删除堆对象 class Location { public : Location ( int xx , int yy ) { X=xx; Y=yy; cout “Constructor called:” X “,” Y endl ; } ; Location ( ) { cout “Constructor called.” endl ; } ; ~Location ( ) { cout “Destructor called.” endl ; } ; private : int X, Y ; } ; void main ( ) { cout “Step One:” endl ; Location *ptr1; ptr1=new Location; // 声明对象指针，并用创建的堆对象地址初始化 delete ptr1 ; cout “Step Two:” endl ; ptr1 = new Location ( 1, 2 ) ; // 对象指针指向一个新创建的堆对象 delete ptr1 ; } ***************************************************************** //创建和删除堆对象数组 # include iostream . h class Location { public : set ( int xx , int yy ) ; ~Location ( ) { cout “Destructor called:” X “,” Y endl ; } ; private : int X , Y ; } ; Location :: set ( int xx , int yy ) { X=xx; Y=yy; cout “Constructor:” X “,” Y endl ; return 0 ; } ; void main ( ) { Location * ptr; ptr= new Location [ 2 ] ; // 堆对象数组初始化指针 ptr [ 0 ] . set ( 5 , 10 ) ; // 调用成员函数 ptr [ 1 ] . set ( 15 , 20 ) ; cout “Deleting ...” endl ; delete [ ] ptr ; } ***************************************************************** class Location { public : Location ( int xx = 0 , int yy = 0 ) { X = xx ; Y = yy ; } Location ( Location p ) ; int GetX ( ) { return X ; } int GetY ( ) { return Y ; } private : int X , Y ; }; Location :: Location ( Location p) { X=p.X; Y=p.Y; cout “Copy_constructor called.” endl ; } main ( ) { Location A ( 1 , 2 ) ; Location B ( A ) ; // 拷贝构造函数被调用 cout “B:” B.GetX ( ) “,” B.GetY ( ) endl ; } ***************************************************************** class Location { public : Location ( int xx = 0 , int yy = 0 ) { X = xx ; Y = yy ; } int GetX ( ) { return X ; } int GetY ( ) { return Y ; } private : int X , Y ; }; main ( ) { Loca