Programming in C++, 2nd Edition

468 Inheritance

{

cout<<“a1=”<<a1 <<“a2=”<<a2 <<“a3=”<<a3 <<“a4=”<<a4;

}

};

int main()

{

clrscr();

A4 a;

a.get(); // Reads data

a.put(); // Displays data

return 0;

}

OUTPUT

Enter values for a1, a2,a3 and a4 : 5 8 7 3

a1= 5 a2 = 8 a3 = 7 a4 = 3

Explanation: In the above program, the classes A1, A2, A3, and A4 are declared, and

each contains one protected member variable. The class A4 has two member functions

get() and put(). The get() function reads integers through the keyboard. The put() func-

tion displays the contents of the member variables on the screen. The classes A2 and A3 are

derived from class A1. While deriving these two classes, ...