C + + Class access restrictions

/*The base class defines the following three types of member variables: public: Both the base class and the derived class object can access the protected: neither the base class nor the object of the derived class can be accessed, and the private is accessible in its own member function: the base class and the pie cannot be accessed by a derived class in its member function .*/#include<iostream>using namespacestd;classitem_base{ Public:    intA;Private:    intb;protected:    intc;};classBulk_item: Publicitem_base{ Public:    voidInit (item_base&Item) {a=2; //B = 2; //Error Privatec =2;//OK protectedITEM.A =1; //item.b = 1;//Error Private//ITEM.C = c * 3;//Error protected    }};intMain () {item_base Item; ITEM.A=1; //item.b = 1; //Error Private//item.c = 1; //Error protectedBulk_item Bulk_item;    Bulk_item.init (item); BULK_ITEM.A=2; //bulk_item.c = 2;//Error protected//bitem.b = 2; //Error Private    return 0;}

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C + + Class access restrictions