?
Solved

class in a class

Posted on 2000-03-09
7
Medium Priority
?
224 Views
Last Modified: 2010-04-02
Sir, I have created a program in which I created a class called bowler. now I created a new class called node and included an object of bowler class in it as a member. How can I access the member variable of class bowler through node class in main? is their any solution?
0
Comment
Question by:jamanat
  • 4
  • 3
7 Comments
 
LVL 31

Expert Comment

by:Zoppo
ID: 2600151
Hi jamanat,

there are multiple possibilities, i.e.:

class bowler {
public:
 int m_iNumber;
 int& GetNumber(){ return m_iNumber; } // returns a reference
....
}

class node {
public:
 bowler m_cBowler;
 int& GetBowlerNumber(){ return m_cBowler.GetNumber(); } // returns a reference
....
}

foo ( node& obj )
{
 int number = obj.m_cBowler.m_iNumber; // direct access
 obj.GetBowlerNumber() = 5; // access via wrapper function, mostly the better way
 obj.m_cBowler.GetNumber() = 5; // the same as befor
// for pointers
 node* pNode = &obj;
 number = pNode->m_cBowler.m_iNumber; // direct access
 pNode->GetBowlerNumber() = 5;
 ...
}

hope that helps,

ZOPPO
0
 
LVL 22

Accepted Solution

by:
nietod earned 90 total points
ID: 2600153
It woudl be a very good idea to post your code with a question like this.  But you probalby have something like

class bowler
{
   public:
     int i;
};

class node
{
    public:
        bowler b;
}

Then in main you can have

int main()
{
   node n;

    // set the int called i inside the bowler inside the node to 5.      
    n.b.i = 5;

    rethrn 0;
};
0
 
LVL 22

Expert Comment

by:nietod
ID: 2600165
Now if the data member ("i" in this case) is not public, then you might need to provide "data member access" functions to let you set the data member.  Like

class bowler
{
   int i;
public:
   void set_i(int x) { i = x; };
};

class node
{
   bowler b;
public:
   Set_b_i(int x) { b.set_i(x); };
}

int main()
{
   node n;

   // set the int called i inside the bowler inside the node to 5.  
   n.set_b_i(5);
    return 0
}


Let me know if you have any questions.
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 22

Expert Comment

by:nietod
ID: 2608180
Hello, Zoppo, how did you get it there before me?
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 2611295
Hmmm, do not know ... directly before I posted my comment I reloaded this question and there wasn't anything posted yet...
0
 
LVL 22

Expert Comment

by:nietod
ID: 2611854
I was two minutes later, but I didn't see you there until later.  Or I would have withdrawn my answer.   You probably shoudl have answered, it certainly seems like that qualifies as an answer.
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 2611976
Seems there're sometimes problems with EE's comment database (I know it coz once they lost one of my comments, Q.10288780) ... but who cares   :)

>You probably should have answered...
I'll try to get used to ...

0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
Suggested Courses

839 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