Question

Question 1: A Daughter and a Son class inherit the Mother class. Each of the classes has print() which outputs the name as class member variable. In the following user code

void callprint(Mother *p){

p->print();

}

int main(){

Daughter *d;

d = new Daughter (“Jessica”);

Mother * m;

m= new Mother (“Jasmine”);

callPrint(m);

Son *s;

s = new Son (“Jeffrey”);

m = d;

callPrint(m);

s = m;

callPrint(m);

system(“pause’);

return 0;

}

1. What are the multiple flaws in the code? Cite them(Marks 7)
2. Rectify the code and use polymorphism of three Mother pointer variables to output the Mother, Daughter and Son names using callPrint()(Marks 8)

use c++

Answer 1

a)the multiple flaws in the code:

The flaws in the program are
1) callprint() must be written instead of callPrint()
2) Can't convert from Mother* to Son* in s=m statement since base class reference can't be converted to child class reference

b) use polymorphism of three Mother pointer variables to output the Mother, Daughter and Son names using callPrint():

Rectified user code is given below

void callprint(Mother *p){
p->print();
}
int main(){
Daughter *d;
d = new Daughter("Jessica");
Mother * m;
m= new Mother ("Jasmine");
callprint(m);
Son *s;
s = new Son ("Jeffrey");
m = d;
callprint(m);
m=s;
callprint(m);
return 0;
}

I am also giving the code for reference:

#include<iostream>
#include<string>
using namespace std;
class Mother
{
public:
string data;
Mother(){}
Mother(string data)
{
this->data=data;
}
void print()
{
cout<<data;
}
};
class Daughter:public Mother
{
public:
Daughter(string data)
{
this->data=data;
}
void print()
{
cout<<data;
}
};
class Son:public Mother
{
public:
Son(string data)
{
this->data=data;
}
void print()
{
cout<<data;
}
};

void callprint(Mother *p){
p->print();
}
int main(){
Daughter *d;
d = new Daughter("Jessica");
Mother * m;
m= new Mother ("Jasmine");
callprint(m);
Son *s;
s = new Son ("Jeffrey");
m = d;
callprint(m);
m=s;
callprint(m);
return 0;
}

Output

hp * 1.) 2:34 AM 1 koushikhp koushikhp@koushikhpnew:- koushikhp@koushikhpnew:$ g++ inher.cpp koushikhp@koushikhpnew :-$ ./a.out Jasmine JessicaJeffreykoushikhp@koushikhpnew:-$