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void CBinaryTree::Save()
{
	SaveWord(root);
}
 
void CBinaryTree::SaveWord(Node* root)
{
	ofstream fout(fileName);
 
	if (root->left != nullptr)
	{
		SaveWord(root->left);
	}
 
	fout << root->english << " " << root->translation << endl;
 
	if (root->right != nullptr)
	{
		SaveWord(root->right);
	}
 
	fout.close();
}

prog.cpp:1:6: error: 'CBinaryTree' has not been declared
 void CBinaryTree::Save()
      ^
prog.cpp: In function 'void Save()':
prog.cpp:3:11: error: 'root' was not declared in this scope
  SaveWord(root);
           ^
prog.cpp:3:15: error: 'SaveWord' was not declared in this scope
  SaveWord(root);
               ^
prog.cpp: At global scope:
prog.cpp:6:6: error: 'CBinaryTree' has not been declared
 void CBinaryTree::SaveWord(Node* root)
      ^
prog.cpp:6:28: error: variable or field 'SaveWord' declared void
 void CBinaryTree::SaveWord(Node* root)
                            ^
prog.cpp:6:28: error: 'Node' was not declared in this scope
prog.cpp:6:34: error: 'root' was not declared in this scope
 void CBinaryTree::SaveWord(Node* root)
                                  ^

Standard output is empty