#include <iostream>

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

class Student {
public:
   static Student* getInstance(const string& name, float gpa) {
      if (!instance) instance = new Student(name, gpa);
      return instance;
   }
   void print() {
      std::cout << name << "\t" << gpa << std::endl;
   }
private:
   Student(const string& n, float g) : name(n), gpa(g) {}
   string name;
   float gpa;
   static Student * instance;
};
Student* Student::instance = NULL;

int main() {
   Student * bob = Student::getInstance("Bob", 3.9);
   Student * zelda = Student::getInstance("Zelda", 3.91);
   bob->print();
   zelda->print();
}