c++ - undefined reference to CLASS::function()

itemprop="text">

So when I try to simply compile my
code using "g++ Asg5.cpp" I receive the following
error

/tmp/cczhpSGO.o: In function 'main':

Asg5.cpp:(.text+0x2fb): undefined reference to
'BinomialTree::insert(int)'

collect2: ld
returned 1 exit
status

If anyone's
wondering why I'm not using a makefile, my professor simply wants to type g++ <.cpp
with main()> to compile..

Anyway here's my
code I really appreciate the
assistance!

Asg5.cpp

#include
            "BinomialTree.h"
#include "BinomialNode.h"
#include
            
#include 
#include
            
#include 
#include
            
#include 
#include
            

using namespace std;
int main(int argc,
            char* argv[])
{
 //input handling
 if(argc !=
            2)
 {
 cout << "Incorrect Usage. \n Example: ./a.out
            " << endl;
 exit(1);
 }

            BinomialTree *tree = new BinomialTree(); 

 char *buffer;

            char *token;
 //read file into
            buffer.**************************************
 string input;

            ifstream file;
 file.open(argv[1]);
 if(file.is_open())

            {
 string str;
 while(file.good())
 {

            getline(file,str);
 input += " " + str;
 }
 }

            else{
 cout << "File not found"<< endl;
 return
            1;
 }
 file.close();

 int buf;

            stringstream ss(input);

 vector
            tokens;

 while(ss >> buf)
 {

            tokens.push_back(buf);
 }
 int i = 0;
 for(i = 0; i <
            tokens.size(); i++)
 tree->insert(tokens[i]);
 //end file reading
            *******************************************
 delete
            tree;
}

BinomialNode.h

#ifndef
            _BINOMIALNODE_H_
#define _BINOMIALNODE_H_
#include
            "BinomialTree.h"
class BinomialNode
{
 public: 

            int k;
 BinomialNode *children[20];
 int data;


            BinomialNode();
};
#endif

BinomialNode.cpp

class
            BinomialNode
{ 
 BinomialNode::BinomialNode(int n)
 {
            
 this->k = 0;
 this->data = n;

            }
}

BinomialTree.h

#ifndef
            _MULTIMAP_H_
#define _MULTIMAP_H_
#include
            "BinomialNode.h"

class BinomialTree
{

            public:
 BinomialNode * BQ[20];


 void
            insert(int n);
 void merge(BinomialNode *queue, BinomialNode *in, int
            k);
 void print(BinomialNode *root, int
            tab);
};
#endif

BinomialTree.cpp

#include
            "BinomialNode.h"
#include "BinomialTree.h"
#include
            
#include
            


class
            BinomialTree
{
 void BinomialTree::insert(int n)

            {
 BinomialNode *in = new BinomialNode(n);
 if(BQ[0] ==
            NULL)
 {
 BQ[0] = in;
 return;
 }

            else
 merge(BQ[0], in, 0);
 }
 void
            BinomialTree::merge(BinomialNode *queue, BinomialNode *in, int k)

            {
 if(queue == NULL)
 {
 BQ[k] = in;

            return;
 }
 if(n == NULL)
 {
 BQ[k] =
            queue;
 return;
 }
 if(queue->data >
            in->data)
 { 
 merge(in, queue);
 return;

            }
 queue->k++;
 BinomialNode* temp[queue->k];
 int
            i;
 for(i = 0; i < queue->k-1; i++)
 temp[i] =
            queue->children[i];
 temp[queue->k-1] = in;
 for(i = 0; i <
            queue->k; i++)
 queue->children[i] = temp[i];

            if(BQ[queue->k] == NULL)
 {
 BQ[queue->k] = queue;

            return;
 }
 else
 merge(queue,
            BQ[queue->k]);
 }
 void BinomialTree::print(BinomialNode *root,
            int tab)
 {
 if(root == NULL)
 return;
 int
            i;
 for(i = 0; i < tab*5; i++) cout << " ";
 cout <<
            root->data << endl;
 for(i = 0; i < root->k; i++)
            print(root->children[i], tab+1);

            }
}

class="post-text" itemprop="text">

class="normal">Answer

You cpp
files shouldn't have Class in them. They should look more
like:

BinomialNode.cpp

#include
            "BinomialNode.h"

BinomialNode::BinomialNode(int n) :

            k(0)
{
 data =
            n;
}

And of
course the corollary for the much longer BinomialTree.cpp. Also, you should compile it
with something like:

g++
            BinomialTree.cpp BinomialNode.cpp Asg5.cpp -o
            asg5

Also you're going
to run into a lot of other problems with you code. For
instance:

BinomialNode *
            BQ[20];

I don't see BQ
being initialized anywhere, which means you're pretty much guaranteed a seg fault if you
were to run this. You need to initialize this or allocate it. Seeing lines
like:

if(BQ[0] ==
            NULL)

Makes me think
you really wanted:

BinomialNode
            BQ[20];

Though you
would still need to initialize it to all NULLs since you aren't guaranteed that will be
full of NULLs when you run the program. Also, this is recursive and infinite and can't
possibly work (in
BinomialNode.h):

BinomialNode
            *children[20];

There
are likely more issues with this code, but that wasn't your question, so I'll stop
now!