i'm not good in english...
then accept my Apologize
in example in file below if you clean & before operator you got an
error
why it couldn't answer when we erase & ?
//phonenumber.h
#ifndef PHONENUMBER_H
#define PHONENUMBER_H
#include <iostream>
using std:
stream;
using std::istream;
#include <string>
using std::string;
class PhoneNumber
{
friend ostream &operator<<( ostream &, const PhoneNumber & );
friend istream &operator>>( istream &, PhoneNumber & );
private:
string areaCode; // 3-digit area code
string exchange; // 3-digit exchange
string line; // 4-digit line
}; // end class PhoneNumber
#endif
----------------
//PhoneNumber.cpp
#include <iomanip>
using std::setw;
#include "PhoneNumber.h"
// overloaded stream insertion operator; cannot be
// a member function if we would like to invoke it with
// cout << somePhoneNumber;
ostream &operator<<( ostream &output, const PhoneNumber &number )
{
output << "(" << number.areaCode << ") "
<< number.exchange << "-" << number.line;
return output; // enables cout << a << b << c;
} // end function operator<<
// overloaded stream extraction operator; cannot be
// a member function if we would like to invoke it with
// cin >> somePhoneNumber;
istream &operator>>( istream &input, PhoneNumber &number )
{
input.ignore(); // skip (
input >> setw( 3 ) >> number.areaCode; // input area code
input.ignore( 2 ); // skip ) and space
input >> setw( 3 ) >> number.exchange; // input exchange
input.ignore(); // skip dash (-)
input >> setw( 4 ) >> number.line; // input line
return input; // enables cin >> a >> b >> c;
} // end function operator>>
Tanx
