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C++ Program to Demonstrate the use of Access Control Specifiers

This C++ program illustrates the use of access control specifiers in a class. The three access control specifiers are as follows : public – member is visible to the user and derived classes, private – member is not visible to the user and derived classes and protected – member is visible to the derived class but not to the user.

Here is the source code of the C++ program illustrates the use of access control specifiers in a class. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Illustrate the use of Access Control Specifiers

```
 */
```
```
#include <iostream>
```
```
 
```
```
class Base {
```
```
    private:
```
```
        int a;
```
```
    protected:
```
```
        int b;
```
```
    public:
```
```
        int c;
```

        Base(int aa = 1, int bb = 2, int cc = 3) : a(aa), b(bb), c(cc) {}

```
        virtual ~Base() {}
```
```
};
```
```
 
```
```
class Derived: public Base {
```
```
    int j;
```
```
    public:
```
```
        Derived(int jj = 0) : j(jj) {}
```
```
        void change()
```
```
        {
```
```
           // 'b' is protected
```
```
           j = b;
```
```
        }
```
```
        void printValue()
```
```
        {
```

            std::cout << "Derived::j = " << j

```
                      << std::endl;
```
```
        }
```
```
};
```
```
 
```
```
int main()
```
```
{
```
```
    Base base;
```
```
    Derived derived;
```
```
 
```

    // 'a' and 'b' are private and protected

    // std::cout << base.a << std::endl;

    // std::cout << base.b << std::endl;

    std::cout << "Base::c = "<< base.c << std::endl;

```
    derived.change();
```
```
    derived.printValue();
```
```
}
```

$ a.out
Base::c = 3
Derived::j = 2