C + + Instantiation Object

I. Instantiating an object from a stack

We first define a class whose name is TV, which includes two member variables and two member functions.

class // define a TV's class TV {public:    char name[//  defines the properties of the class, an array    int type;     void // defining member functions    void power ();}

The following begins instantiating an object from the stack

If you define an object, we write an object TV behind the class TV;

If you define an array of objects, we write the array object behind the class TV tv[20], and 20 is the element required by the array.

int Main (void) {    TV TV;         // defining an Object    TV tv[];    // defining an array    of objects return 0 ;}

Example:

#include <iostream>#include<stdlib.h>using namespacestd;classCoordinate//define a class coordinate (coordinates){ Public://Access Qualifier    intX//define a member variable x (coordinate x)    intY//define a member function y (coordinate y)    voidPrintx ()//defines a member function Printx (), which is the function of the output x value{cout<< x <<Endl; }     voidPrinty ()//defines a member function Printy (), which is the function of the output Y value{cout<< y <<Endl; }};intMainvoid){    //instantiate a class in a stackcoordinate coor;//coor is an instantiated object defined in the stackCoor.x =Ten;//accessing a data member, assigning a value to a member variable xCOOR.Y = -; Coor.printx ();//Calling member functionscoor.printy ();}

Ii. instantiating an object from a heap

We first define a class whose name is TV, which includes two member variables and two member functions.

class // define a TV's class TV {public:    char name[//  defines the properties of the class, an array    int type;     void // defining member functions    void power ();}

The following begins instantiating an object from the stack

When instantiating an object in a heap, we first request a piece of memory to give the memory to the instantiated object or group of objects;

After use, we will release the memory.

int Main (void) {    new//  Request an object in the heap    new tv[  - // request an Array object in the heap, 20 variables    Delete p;    // frees the memory    of an object Delete // frees an array of memory    return 0 ;}

Example:

#include <iostream>#include<stdlib.h>using namespacestd;classCoordinate//define a class coordinate (coordinates){ Public://Access Qualifier    intX//define a member variable x (coordinate x)    intY//define a member function y (coordinate y)    voidPrintx ()//defines a member function Printx (), which is the function of the output x value{cout<< x <<Endl; }     voidPrinty ()//defines a member function Printy (), which is the function of the output Y value{cout<< y <<Endl; }};intMainvoid){    //instantiate a class in a heapCoordinate *p =Newcoordinate (); P->x = -;//assign a value to x in the form of a pointerP->y = $; P->printx ();//calling a function as a pointerP->Printy (); System ("Pause"); return 0;}

C + + Instantiation Object