How do I assign a value to a pointer when the value is being returned by a function?

// inheritance , polymorphism
#include<iostream>
#include<string>

using namespace std;

class person
{
	public :
		int age;
		string name;
		string get_name()
		{
			cout<<"Please enter the name"<<endl;
			cin>>name;
			return name;
		}
		int get_age()
		{
			cout<<"enter the age"<<endl;
			cin>>age;
			return age;
		}
};

class student : public person
{
  private : 
  int id;
  char section;
  public:
  int get_id(){
  	cout<<"enter the id of the student"<<endl;
  	cin>>id;
  	return id;
  }
  char get_section()
  {
  	cout<<"enter the section"<<endl;
  	cin>>section;
  	return section;
}	
};

int main()
{
int *a;
string n;
student s;
int i;
char sec;
char c;
n=s.get_name();
*a=s.get_age();
cout<<"is this person a student? please enter y or n"<<endl;
cin>>c;
if (c=='y')
{
	i=s.get_id();
	sec=s.get_section();
	cout<<" My name is "<<n<<" my age is "<<*a<<" my id is "<<i<<" my sec is "<<sec;
}
if (c=='n')
{

	cout<<"My name is "<<n<<" my age is "<<*a<<" I am not a student ";
}

}