Question

I made a class student

    class student
{
      private:
              string ID;
              string name;
              int age;
      public:
             ....
};

I want to get values from user and put it in a map so I created an Operator>> Overloading

istream& operator>> (istream& in, student person){
    string newID;
    string newname;
    int newage;
    return in;
}

and so when it goes to the cin part

    student person;
    cin>>person;

when it adds person to the data map it calls for values from the default constructor and not the cin

What to do?

Answer 1

The operator needs to take the second argument by reference:

istream& operator>>(istream& in, student& person) {
                                        ^ HERE

Otherwise the changes you make to person never make it out of operator>>().