/********************************************************
  How do you define an operator overload < to an object?
  An object contains several kinds of information.  Decide 
  which information is a criteria to put two objects in order. 
  After that implement it.   
*********************************************************/

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

class Student 
{ 
public:
    Student(int akey=0, string aname='\0', char agrade='\0')
    {
                key = akey;
                name = aname;
                Grade = agrade;
    }
                        
    int key; 
    string name; 
    char Grade; 
};
 
int operator< (Student x, Student y) 
{ 
    return x.key < y.key; 
} 

template <class T>      //template class can be any data type 
T Func(T x, T y) 
{ 
    if(x < y) 
        return x; 
    else 
        return y; 
} 

int main() 
{ 
    double A=5.3, B=1.7; 

    cout<<"Func(A, B): "<<Func(A, B)<<endl;
    
    Student P(18,"John",'A'), Q(21,"Ruth",'B');

    cout <<"Print information of P:"<<endl;  
    cout <<P.key <<" " <<P.name <<" " <<P.Grade<<endl; 

    Student R = Func(P, Q); 

    cout<<"Print the less object: "<<endl;
    cout <<R.key <<" " <<R.name <<" " <<R.Grade<<endl; 
    system("pause");
    return 0;
}