The operator has been used for more than one meaning.
That is, the same operator is used on the different places.

The symbol, *, is used as

• multiply           e.g.  A = B * C;
• pointer             e.g.  char * gradeprt;
• derefernce        e.g.  *gradeprt = 'A';

Example of overload the addition:

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

class Student 
{ 
public:
    Student(int akey=0, string aname='\0', double acash=0)
    {
                key = akey;
                name = aname;
                cash = acash;
    }
                        
    int key; 
    string name; 
    double cash; 
};
 
Student operator+ (Student x, Student y) 
{ 
        Student s(12345, "Combine", x.cash + y.cash);
        return s; 
} 

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,"Ruth",102.5), Q(21,"John",56);
    cout <<"Print information of P:"<<endl;  
    cout <<P.key <<" " <<P.name <<" " <<P.cash<<endl; 

    Student R = P+Q; 
    cout<<"Print the less object: "<<endl;
    cout <<R.key <<" " <<R.name <<" " <<R.cash<<endl; 
    system("pause");
    return 0;
}