#include<iostream> #include<string> using namespace std; class Student { protect

Question

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

class Student
{
protected:
string name;
public:
Student() {name="Default";}
Student(string n) {name=n;}
string get_name(){return name;}
void set_name(string n){name=n;}
void output() {cout<< "Name: " << name << endl;}
};

class GradStudent: public Student
{
protected:
double stipend;
public:
GradStudent(string n, double s);
void output();
};

void process(Student& who);
// outputs the details of the student

int main()
{
Student One("Joe");
GradStudent Two("Susan", 2517.42);

process(One);
process(Two);

return 0;
}

void process(Student& who)
{
who.output();
}

GradStudent::GradStudent(string n, double s)
{
Student();
name = n;
stipend = s;
}

void GradStudent::output()
{
// Hmmm. This should work for Susan, but it doesn't.
cout << "My name is: " << name << " and my stipend is: $" << stipend << endl;
}

Explanation / Answer

I added virtual to the parent class output function so it would properly access the child function

--------------------------------------------------------------

#include <iostream>
#include <string>

using namespace std;

class Student
{
protected:
string name;
public:
Student() {name="Default";}
Student(string n) {name=n;}
string get_name(){return name;}
void set_name(string n){name=n;}
virtual void output() {cout<< "Name: " << name << endl;}
};

class GradStudent: public Student
{
protected:
double stipend;
public:
GradStudent(string n, double s);
void output();
};

void process(Student& who);
// outputs the details of the student

int main()
{
Student One("Joe");
GradStudent Two("Susan", 2517.42);

process(One);
process(Two);

return 0;
}

void process(Student& who)
{
who.output();
}

GradStudent::GradStudent(string n, double s)
{
Student();
name = n;
stipend = s;
}

void GradStudent::output()
{
// Hmmm. This should work for Susan, but it doesn't.
cout << "My name is: " << name << " and my stipend is: $" << stipend << endl;
}

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