error: ISO C++ forbids declaration of ‘CreateNode’ with no type [-fpermissive]

[Rahul04789]

Hi,

I am compiling following file, and I am getting the error: ISO C++ forbids declaration of ‘CreateNode’ with no type [-fpermissive]

1) BinaryTree.h

ifndef BINARY_TREE_H
#define BINARY_TREE_H
namespace MyProject
{
namespace BinaryTree
{
class Node
{
Node * m_lnode;
int m_data;
Node * m_rnode;
public:
Node();
void CreateNode(const int & data);
};

class BinaryTree
{
Node * m_newNode;
public:
BinaryTree();
void InsertNode(const Node *newNode);
};
}
}

#endif


2) BinaryTree.cpp

#include "BinaryTree.h"
#include <iostream>

namespace BinaryTree = MyProject::BinaryTree;

BinaryTree::Node::Node():m_lnode(NULL),
m_rnode(NULL)
{
}
BinaryTree::Node::CreateNode(const int & data)
{
m_data = data;
}
BinaryTree::BinaryTree::BinaryTree():m_newNode(NUL L)
{
}
int main()
{
return 0;
}


After compiling from g++,
# g++ -g -o a BinaryTree.cpp

I am getting the following three errors:


BinaryTree.cpp:10:46: error: ISO C++ forbids declaration of ‘CreateNode’ with no type [-fpermissive]
BinaryTree::Node::CreateNode(const int & data)
^
BinaryTree.cpp:10:1: error: prototype for ‘int MyProject::BinaryTree::Node::CreateNode(const int&)’ does not match any in class ‘MyProject::BinaryTree::Node’
BinaryTree::Node::CreateNode(const int & data)
^
In file included from BinaryTree.cpp:1:0:

BinaryTree.h:14:8: error: candidate is: void MyProject::BinaryTree::Node::CreateNode(const int&)
void CreateNode(const int & data);
^


Regards,
Rahul Kumar

[spjackson]

As the error message tells you, you must include the return type when defining a function, i.e.


void BinaryTree::Node::CreateNode(const int & data)
{
m_data = data;
}