C++ Derived Classes Given the Person class: #include <iostream> #include <string

Question

C++ Derived Classes

Given the Person class:

#include <iostream>
#include <string>
using namespace std;

class Person{
private:
   string name;
   double age;  
public:
Person() {
   name = "NoName";
       age = 0;
   }

Person(string newname, int newage) {
   name = newname;
age = newage;
   }

void setName(string newname) {
name = newname;
}

void setAge(int newage) {
age = newage;
}
  
virtual void display(ostream& out){
       out << "Name " << name << " Age " << age << endl ;
   }   
};

And the class Girl:

class Girl: public Person{
private:
   int weight;
public:
   Girl( ):Person("Heidi", 15){
weight = 100;
}
Girl(string newname, int newage, int newweight ){
weight = newweight;
}
   void display(ostream& out) {
cout << "weight is " << weight << endl;
   }
};

1) What would be the output for the following?

int main() {
Person mel (

Explanation / Answer

1. Output is: Name mel Age 30
weight is 95
2. Person class is not an abstract class because it doesn't have any abstract method.

3.

#include <iostream>
#include <string>
using namespace std;

class Person{
private:
string name;
double age;
public:
Person() {
name = "NoName";
age = 0;
}
Person(string newname, int newage) {
name = newname;
age = newage;
}
void setName(string newname) {
name = newname;
}
void setAge(int newage) {
age = newage;
}
  
virtual void display(ostream& out){
out << "Name " << name << " Age " << age << endl ;
}   
};
class Girl: public Person{
private:
int weight;
public:
Girl( ):Person("Heidi", 15){
weight = 100;
}
Girl(string newname, int newage, int newweight ){
weight = newweight;
}
void display(ostream& out) {
cout << "weight is " << weight << endl;
}
};

class Boy: public Person {
private:
   string eyecolor;
public:
   Boy(string name, string color) {
       eyecolor = color;
       name = name;
       age = 0;
   }
   Boy(string name, string color,int age) {
       eyecolor = color;
       name = name;
       age = age;
   }

   void display() {
       cout << cout << "Name " << name << " Age " << age << " eyecolor " << eyecolor << endl ;
   }
};
int int main(int argc, char const *argv[])
{
   Boy bb("Roy", "green", 3);
   bb.display();
   return 0;
}

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