C + + 's lesson object-oriented (i)

What is a class and what is an object? How do I define a class? How do I define an object?

First, to define a human

　　

class person{  public:      void  getweight ();       void   setweight ();   Private:    int  weight;      };

Declare a human with the class keyword. Now just declaring a class without using a class? The system does not allocate memory to the class. Public is a common member method. Private is a privately owned data member. When declaring a class, do not forget the (;) number.

Then we can define an object for a human such as:

Person Jack;

What is the difference between a class and an object?

A class is abstract, and an object is an instance of a class.

Now that we know the difference between a class and an object, how do you access the members and methods of the object? We can use (.) To access

such as Jack.wight; Access members

You can also assign a value to a member Jack.wight = 160;

such as Jack.getweight (); Access method

Instance explaining the data members and methods in the calling class

　

#include <iostream>using namespacestd;//---------------------------------------------------------------------------classperson{ Public:    voidSetweight (intm_weight); voidgetweight ();Private:    intWeight;};voidPerson::setweight (intm_weight) {Weight=m_weight;}voidperson::getweight () {cout<<Weight<<Endl;}int_tmain (intARGC, _tchar*argv[])    {Person Jack; Jack.setweight ( the);    Jack.getweight (); return 0;}//---------------------------------------------------------------------------

　　

The above is the most basic class of calls.

　　

　

C + + 's lesson object-oriented (i)