C ++ class Explanation base portion

struct structure must have basic grammar are very familiar with, but in C ++, struct features not make good use of C ++

Now to introduce the class: class

In the class with the structure, we can control access to members , divided into three kinds:

public	Public access, free access to
private	Private access, can only be a member of itself (no matter what access rights) access, can not inherit
protected	Protected members, only through inheritance or friend visit

 

 

 

 

 

 

There may have been some unfamiliar terms, do not worry placed first

 

Statement example:

. 1  class the EXAMPLE
 2  {
 . 3  public : // public
 . 4      int publicdata = . 1 ;
 . 5  Private : // private
 . 6      int PrivateData = 0 ;
 . 7  protected : // protected
 . 8      int ProtectData = - . 1 ;
 . 9 } ; // the Attention! !!

If we write:

1 class EXAMPLE
2 {
3     int UnknownData=1;
4 private:
5     int PrivateData=0;
6 protected:
7     int ProtectData=-1;
8 };

Now UnknownData property is private , it is the structure of different places

Very important : the structure default is public, and the class is private by default

 

In fact, the class declaration and the large-diameter structure is the same, but see here still do not see where there is different, please wait for the next chapter