Solved

How to overload <<

Posted on 1999-01-04
4
200 Views
Last Modified: 2010-08-05
Say is there anything wrong in this code.i want to overload <<.

#include <iostream.h>

class Boy
{
 friend iostream& operator << (iostream&,Boy &);
 public:Boy(int a) {age=a;}
 private:int age;
};

iostream& operator << (iostream& ios,Boy &b)
{
 ios << b.age;
 return ios;
}
main()
{
 Boy b(1);
 cout << b;
}


I want the age of the boy to be printed whenever i give cout<<b ...but the compiler gives an error (illegal structure format for cout << b)

Please help immediately.
0
Comment
Question by:girishr
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 8

Expert Comment

by:Answers2000
ID: 1181492
Don't you mean ostream& instead of all those iostream&'s ?
0
 

Expert Comment

by:Mithander
ID: 1181493
Classes default to Private.  There for the:
friend iostream& operator << (iostream&,Boy &);
would be private.  I am not sure if this matters because it is not a member function.  Just a thought though.
0
 

Accepted Solution

by:
koskia earned 100 total points
ID: 1181494
Answer2000 is right,
you should use ostream and not iostream
this should solve the problem.
the cout object recieves ostreams, which is driven from iostream, ofcourse it can't make the downcast
0
 

Author Comment

by:girishr
ID: 1181495
Thanks.I knew it all the time and i still made a mistake..
mithander i do not think friends area affected by public and private
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Often, when implementing a feature, you won't know how certain events should be handled at the point where they occur and you'd rather defer to the user of your function or class. For example, a XML parser will extract a tag from the source code, wh…
  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question