C++ overloading extraction operator

petercool · 08-31-2003, 06:17 AM

C++ overloading extraction operator

What does line 9 do?

istream& operator >> (istream& str_in, struct data& d)
{
cout << "Enter Name : ";
str_in.getline(d.name,20);
cout << "Enter Age :";
str_in >> d.age;
cout << "Enter Height : ";
str_in >> d.height;
str_in.get(); // line 9
return(str_in);
}

Hko · 08-31-2003, 08:03 AM

Quote from "info iostream":

Code:

 - Method: istream& istream::get (streambuf& SB [, char DELIM])
     Read characters from the input stream and copy them on the
     `streambuf' object SB.  Copying ends either just before the next
     instance of the delimiter character DELIM (newline `\n' by
     default), or when either stream ends.   If DELIM was present in
     the input, it remains available as if unread.

petercool · 09-01-2003, 10:57 AM

Sorry but I don't quite understand that.

devoyage · 09-01-2003, 02:20 PM

the delimiter '\n' is still in the input stream. that last get() will take it out so that it doesn't screw with your program later.

ex, if you had this later:

Code:

char input;
cout << "Please enter a character: ";
cin.get(input);

the program would just whiz by, placing a '\n' (or whatever the delimiter was) into "input".

EDIT:

Hko, how did you get the iostream (and I'm guessing STL) documentation in the info system? I can't find it there?

Thanks

petercool · 09-02-2003, 10:11 AM

Thanks I think I understand now

Hko · 09-06-2003, 06:35 AM

Quote:

Originally posted by devoyage
Hko, how did you get the iostream (and I'm guessing STL) documentation in the info system? I can't find it there?

On my (debian sarge) system, this command gets me there:

info -f iostream-295

If this doesn't work, try CTRL-s or just s to search for "ios..."