Pointer to an object in inheritance - c++

Question

Here I'm not getting correct output, Here I used inheritance concept, but I don't know, how to call method using object of pointer type.
Please some one give me some solution.
#include <iostream>
#include <cstring>
#include <iomanip>
using namespace std;
class person
{
private:
char *name,*blood,*dob;
int height,weight;
public:
static int count;
person()
{
strcpy(name,"Name");
strcpy(blood,"Blood");
height=0;
weight=0;
}
~person()
{
}
friend class person_info;
};
class person_info
{
private:
char *add,*tel,*lic,*insu;
public:
void getdata(person *obj,int n);
void display(person *obj);
};
void person_info::getdata(person *obj,int n)
{
for(int i=0;i<n;i++)
{
cin.ignore();
cout<<"Enter Name Of the Person : ";
cin.getline(obj->name,30);
cout<<"Enter Blood group Of the Person : ";
cin.getline(obj->blood,30);
cout<<"Enter date of birth of the Person : ";
cin.getline(obj->dob,30);
cout<<"Enter Height of the Person : ";
cin>>obj->height;
cout<<"Enter Weight of the Person : ";
cin>>obj->weight;
cout<<"Enter Address Of the Person : ";
cin.getline(this->add,30);
cout<<"Enter Insurance no. Of the Person : ";
cin.getline(this->insu,30);
cout<<"Enter Telephone no Of the Person : ";
cin.getline(this->tel,30);
cout<<"Enter License no the Person : ";
cin.getline(obj->blood,30);
}
}
void person_info::display(person *obj)
{
cout<<setw[10]<<"Name"<<setw[10]<<"Address"<<setw[10]<<"D. O. B."<<setw[3]<<"Blood G."<<setw[4]<<"Height"<<setw[10]<<"Weight"<<setw[10]<<"Insrn No."<<setw[10]<<"Tele No."<<setw[11]<<"Licence No.";
cout<<setw[10]<<obj->name<<setw[10]<<this->add<<setw[10]<<obj->dob<<setw[3]<<obj->blood<<setw[4]<<obj->height<<setw[10]<<obj->weight<<setw[10]<<this->insu<<setw[10]<<this->tel<<setw[11]<<this->lic;
}
int main()
{
int ch=0,i=0,n;
do
{
cout<<"1.getdata"<<endl;
cout<<"2.display data"<<endl;
cout<<"Enter choice";
cin>>ch;
person_info *p[2]; \\I think this part is not correct
p[2]=new person_info(); \\I think this part is not correct
person *p1[2]; \\I think this part is not correct
p1[2]=new person(); \\I think this part is not correct
switch(ch)
{
case 1:
cout<<"Enter No. Entries to be Entered :";
cin>>n;
p[2]->getdata(p1[2],n);
break;
case 2:
for(int j=0;j<i;j++)
{
p[i]->display(p1[i]);
}
break;
}
}while(ch!=3);

Answer 1

You neither initialized your members char *name,*blood,*dob;, nor you allocated memory for them. I recommend to use std::string instead of char*.
#include <string>
class person
{
private:
std::string name;
std::string blood;
public:
person()
: name( "Name" )
, blood( "Blood" )
{}
person( const char *n, const char *b )
: name( n )
, blood( b )
{}
};
Note: strcpy(name,"Name"); copies the string "Name" to the memory referenced by char *name, but you never allocate any dynamic memory for name. name is not initialized and undefined.