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03.26.2008 at 03:48PM PDT, ID: 23272417

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9.4

Linked List

Zone: C++ Programming Language

Tags: C++

I'm trying to create a linked list of a class but I get some error msg wen I try to display the data.

I have a class called student and I'm creating another class called course that will have a linked list of student objects.

Here is my course class information. What I have for now (it's not completed)

here is the error:
error: 'class student' has no member named 'next'

What did I do wrong?

         
           
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             course.h file
*******************
#ifndef COURSE_H
#define COURSE_H
#include "student.h"
#include <fstream>
class course{
      public:
         course();
         void show();
         student * first;
         student * next;
};
#endif
 
course.cpp
**********************
...all the declaration
 
course::course(){
   first = next = NULL;
}
 
course::show(){
   for(student * temp = first; temp; temp = temp->next){
       temp->show();
       cout << endl;
   }
}

           
         

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Question Stats

Zone: Programming

Question Asked By: Ennio

Solution Provided By: Infinity08

Participating Experts: 2

Solution Grade: A

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03.26.2008 at 03:51PM PDT, ID: 21217263

Rank: Genius

Infinity08:

>> error: 'class student' has no member named 'next'

I guess that's a pretty straightforward error message ... no ?

03.26.2008 at 03:57PM PDT, ID: 21217296

Ennio:

I know that is a straightforward , but I'm trying the sample from a book and looks like I'm doing some wrong here.

Should I have a node class in my course.h?

I'm just trying to get a baisc linked list to work.

03.26.2008 at 03:59PM PDT, ID: 21217314

Rank: Genius

Infinity08:

>> Should I have a node class in my course.h?

That's probably a good idea. Make sure that the node has a next pointer, as well as a student object in it.

03.26.2008 at 04:03PM PDT, ID: 21217327

peetm:

Looks like courses have the students' linked-list.

Looks like you're needing temp = this -> next;

A bit of a bizarre layout/design imho - but then again, I'm on my second glass of wine now!

03.26.2008 at 04:14PM PDT, ID: 21217387

Ennio:

ok I made some change here is how it look.

I'm now only having a problem when I try to access the student class the show() function to display the information.

when I do the temp->show();

I get this error.

course.cpp:25: error: 'class course::Node' has no member named 'show'

         
           
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             course.h
***********************
#ifndef COURSE_H
#define COURSE_H
#include "student.h"
#include <fstream>
class course{
	private:
		class Node{
			public:
				student data;
				Node * next;
		};
		Node * first;
		int mySize;
	public:
		course();
		void show();
};
#endif
 
**********
course.cpp
 
 
using namespace std;
#include "course.h"
 
//Create an empty list
course::course(){
	first = NULL;
	mySize = 0;
}
 
void course::show(){
	Node * temp;
	for (temp = first; temp != NULL; temp = temp->next){
		temp->show();
	}
}
           
         

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03.26.2008 at 04:16PM PDT, ID: 21217398

Rank: Genius

Infinity08:

>> course.cpp:25: error: 'class course::Node' has no member named 'show'

Is show a member of the student class ? If so, make sure you call it for a student object (not for a node object)

03.26.2008 at 04:21PM PDT, ID: 21217424

Ennio:

yes, show is a member of the student class, and has the cout statement to display the data from the student class.

how can I call it from the student object?

03.26.2008 at 04:22PM PDT, ID: 21217430

Rank: Genius

Infinity08:

>> how can I call it from the student object?

Isn't the student object a member of the node object ? And isn't temp a pointer to a node object ?

03.26.2008 at 04:23PM PDT, ID: 21217438

Ennio:

yes.

So can I do something like this.

temp->data.show();

03.26.2008 at 04:24PM PDT, ID: 21217448

Rank: Genius

Infinity08:

>> So can I do something like this.
>>
>> temp->data.show();

Correct ;)

Accepted Solution