ostream and istream operator for a class : overload ostream istream operator « Operator Overloading « C++ Tutorial

1. C++ Tutorial
2. Operator Overloading
3. overload ostream istream operator

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

class MyClass {
  char name[80];
  int id;
  int prefix;
  int value;
public:
  MyClass() { };
  MyClass(char *n, int a, int p, int nm)
  {
    strcpy(name, n);
    id = a;
    prefix = p;
    value = nm;
  }
  friend ostream &operator<<(ostream &stream, MyClass o);
  friend istream &operator>>(istream &stream, MyClass &o);
};

// Display name and phone valueber.
ostream &operator<<(ostream &stream, MyClass o)
{
  stream << o.name << " ";
  stream << "(" << o.id << ") ";
  stream << o.prefix << "-" << o.value << "\n";

  return stream; // must return stream
}

// Input name and telephone valueber.
istream &operator>>(istream &stream, MyClass &o)
{
  cout << "Enter name: ";
  stream >> o.name;
  cout << "Enter id: ";
  stream >> o.id;
  cout << "Enter prefix: ";
  stream >> o.prefix;
  cout << "Enter value: ";
  stream >> o.value;
  cout << "\n";

  return stream;
}

int main()
{
  MyClass a;

  cin >> a;

  cout << a;

  return 0;
}

Enter name: Joe
Enter id: 123
Enter prefix: 1
Enter value: 2

Joe (123) 1-2