Cursor to class in C ++

A pointer to a class in C ++ is executed in the same way as a pointer to a structure; and to access members of a pointer to a class you use the member access operator in C ++ as the -> operator, as you do with pointers to the structure. As with all pointers, you must declare the cursor before using it.

Try the following example to understand the concept of a pointer to a class in C ++:

 #include using namespace  std ; class Box { public : // phan dinh nghia Constructor Box ( double  dai = 1.0 , double  rong = 1.0 , double  cao = 1.0 ) {  cout  << "Constructor duoc goi." <<  endl ;  chieudai  =  dai ;  chieurong  =  rong ;  chieucao  =  cao ; } double  theTich () { return  chieudai  *  chieurong  *  chieucao ; } private : double  chieudai ; // chieu dai cua mot box double  chieurong ; // chieu rong cua mot box double  chieucao ; // chieu cao cua mot box }; int  main ( void ) { Box Box1 ( 2.4 , 4.2 , 2.2 ); // khai bao box1 Box Box2 ( 4.5 , 2.0 , 3.2 ); // khai bao box2 Box * controBox ; // khai bao con tro toi mot class. // luu giu dia chi cua doi tuong dau tien  controBox  = & Box1 ; // bay gio thu truy cap mot thanh vien boi su dung  toan tu truy cap thanh vien  cout  << "The tich cua Box1 la: " <<  controBox -> theTich () <<  endl ; // luu giu dia chi cua doi tuong thu hai  controBox  = & Box2 ; // bay gio thu truy cap mot thanh vien boi su dung  toan tu truy cap thanh vien  cout  << "The tich cua Box2 la: " <<  controBox -> theTich () <<  endl ; return 0 ; } 

Compiling and running the above C ++ program will produce the following results:

According to Tutorialspoint

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