I was solving this question on hacker rank and it used the concept of virtual functions, vptr, and vtable, I just can't figure out what the compiler wants to say and how to I correct it. It seems to be some error with vtable although I have no prior experience with how virtual functions work it was my first program that failed eventually
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
class Person
{
public:
int mem_Name;
int age;
virtual void getdata();
virtual void putdata();
};
class Professor : public Person
{
public:
int publ;
int cur_id=0;
void getdata()
{
cin>>mem_Name;
cin>>age;
cin>>publ;
}
void putdata()
{
cout<<mem_Name<<" "<<age<<" "<<publ<<" "<<cur_id<<endl;
}
Professor()
{
cur_id++;
}
};
class Student : public Person
{
public:
int marks[6];
int cur_id=0;
int sum;
void getdata()
{
cin>>mem_Name;
cin>>age;
for(int i=0;i<6;i++)
{cin>>marks[i];
sum+=marks[i];}
}
void putdata()
{
cout<<mem_Name<<" "<<age<<" "<<sum<<" "<<cur_id<<endl;
}
Student()
{
cur_id++;
}
};
int main(){
int n, val;
cin>>n; //The number of objects that is going to be created.
Person *per[n];
for(int i = 0;i < n;i++){
cin>>val;
if(val == 1){
// If val is 1 current object is of type Professor
per[i] = new Professor;
}
else per[i] = new Student; // Else the current object is of type Student
per[i]->getdata(); // Get the data from the user.
}
for(int i=0;i<n;i++)
per[i]->putdata(); // Print the required output for each object.
return 0;
}
The error goes something like thisenter image description here
