如何导出Excel 2文件

Question

如何导出excel 2文件

GenBST.h: In instantiation of ‘GenBST<T>::GenBST(const GenBST<T>&) [with T = 
Student]’:
Menu.cpp:419:65:   required from here
GenBST.h:54:32: error: binding ‘GenTreeNode<Student>* const’ to reference of 
type ‘GenTreeNode<Student>*&’ discards qualifiers
     copyTree(this->root, other.root);
                          ~~~~~~^~~~
GenBST.h:108:6: note:   initializing argument 2 of ‘void 
GenBST<T>::copyTree(GenTreeNode<T>*&, GenTreeNode<T>*&) const [with T = 
Student]’
 void GenBST<T>::copyTree(GenTreeNode<T> *& thisNode, GenTreeNode<T> *& 
otherNode) const {   

问题是得到一个excel，我想要2个文件谢谢。