The uncompleted programs to run in Java and in C are given b

The uncompleted programs to run in Java and in C++ are given below. Note that you need to create a driver class with the main method to run the Java program. Also, you need to write the main function to run the C++ program.

a). predict the output of the Java program.

b). run the Java program and compare your prediction to the actual output of the program.

c). Complete the C++ program such that it prints the same output as the Java program does. You need to use the given classes to generate the desired output.

The Java Program is:

class A {

public void p() {

System.out.println(“A.p”); }

public void q() {

System.out.println(“A.q”); }

public void r() {

p(); q(); }

}

class B extends A {

public void p() {

System.out.println(“B.p”); }

}

class C extends B {

public void q() {

System.out.println(“C.q”); }

public void r() { p(); q(); }

} …

A a;

C c = new C();

a = c;

a.r();

a = new B();

a.r();

a = new C();

a.r();

The C++ Program is:

class A {

public: virtual void p() {

cout << “A.p” << endl; }

void q() {

cout << “A.q” << endl; }

virtual void r() { p(); q(); }

};

class B : public A {

public: void p() {

cout << “B.p” << endl; }

};

class C : public B {

public: void q() {

cout << “C.q” << endl; }

void r() {

p(); q(); }

};

Solution

class A {
   public void p() {
       System.out.println(\"A.p\");
   }
   public void q() {
       System.out.println(\"A.q\");
   }
   public void r() {
       p();
       q();
   }
}
class B extends A {
   public void p() {
       System.out.println(\"B.p\");
   }
}
class C extends B {
   public void q() {
       System.out.println(\"C.q\");
   }
   public void r() {
       p();
       q();
   }
}
class Driver{
   public static void main(String args[]){
       A a;                       // instianite A class
       C c = new C();               // Create C object
       a = c;                       // assign c object to a
       a.r();                       // on calling r() the output would be B.p, C.q
       a = new B();               // assign B object to a
       a.r();                       // on calling r() the output would be B.p,A.q
       a = new C();               // assign C object to a
       a.r();                       // the output would be B.p, C.q
   }
}

/* sample output

B.p
C.q
B.p
A.q
B.p
C.q

*/

#include <iostream>
using namespace std;
class A {
public: virtual void p() {
cout << \"A.p\" << endl; }
void q() {
cout << \"A.q\" << endl; }
virtual void r() { p(); q(); }
};
class B : public A {
public: void p() {
cout << \"B.p\" << endl; }
};
class C : public B {
public: void q() {
cout << \"C.q\" << endl; }
void r() {
p(); q(); }
};

int main(){
   A a;
   C c;
   B b;
   c.r();           // call r function of c object
   b.r();           // call r function of b object
   c.r();           // call r funciton of c object
}

/*

smaple output

*/