Understanding of Public,protected,private in C + +

1 classBaseClass2 {3  Public:4     intPublic_int;5 Private:6     intPrivate_int;7 protected:8     intProtected_int;9 };Ten  One classDerivedClass: PublicBaseClass { A  Public: -     voidUsepublicint () -     { thePublic_int =1;//correct -     } -     voidUserprivateint () -     { +Private_int =1;//Error: member BaseClass::p rivate_int not accessible -     } +     voidUserprotectedint () A     { atProtected_int =1;//correct -     } - }; -  - //protected has an effect on Protectedderivedclass's derived classes and user and friend functions, and has no effect on Protectedderivedclass's own member functions - classProtectedderivedclass:protectedBaseClass { in  Public: -     voidUsepublicint () to     { +Public_int =1;//correct baseclass::p ublic_int is public -     } the     voidUserprivateint () *     { $Private_int =1;//Error: member BaseClass::p rivate_int not accessiblePanax Notoginseng     } -     voidUserprotectedint () the     { +Protected_int =1;//correct A     } the }; +  - intMain () $ { $ BaseClass BaseClass; -Baseclass.public_int;//correct -Baseclass.protected_int;//Error: member BaseClass::p rotected_int not accessible theBaseclass.private_int;//Error: member BaseClass::p rivate_int not accessible - Wuyi DerivedClass DerivedClass; theDerivedclass.public_int;//correct -Derivedclass.protected_int;//Error: member BaseClass::p rotected_int not accessible WuDerivedclass.private_int;//Error: member BaseClass::p rivate_int not accessible -  About Protectedderivedclass Protectedderivedclass; $Protectedderivedclass.public_int =1;//Error: member BaseClass::p ublic_int not accessible cause protectedderivedclass:p rotected DerivedClass, Public_int is PROTECTD for protectedderivedclass users, so no access -Protectedderivedclass.protected_int;//Error: member BaseClass::p rotected_int not accessible -Protectedderivedclass.private_int;//Error: member BaseClass::p rivate_int not accessible -}

Understanding of Public,protected,private in C + +