diff --git a/ch17/ex17.3/main.cpp b/ch17/ex17.3/main.cpp
deleted file mode 100644
index bfccd8d0..00000000
--- a/ch17/ex17.3/main.cpp
+++ /dev/null
@@ -1,27 +0,0 @@
-/***************************************************************************
- *  @file       main.cpp
- *  @author     Alan.W
- *  @date       3  Mar 2014
- *  @remark     This code is for the exercises from C++ Primer 5th Edition
- *  @note
- ***************************************************************************/
-//!
-//! Exercise 17.3:
-//! Rewrite the TextQuery programs from § 12.3 (p. 484) to use a tuple instead
-//! of the QueryResult class. Explain which design you think is better and why.
-//!
-//  The orignal way is more formal.The second way is quick to implement ,but hard to
-//  refactor.So the second way is better for testing.
-//!
-
-#include <iostream>
-#include <tuple>
-#include <string>
-#include <vector>
-
-
-int main()
-{
-
-
-}
diff --git a/ch17/ex17.3/textquery.cpp b/ch17/ex17.3/textquery.cpp
deleted file mode 100644
index e255ea2b..00000000
--- a/ch17/ex17.3/textquery.cpp
+++ /dev/null
@@ -1,97 +0,0 @@
-/***************************************************************************
- *  @file       textqueryr.cpp
- *  @author     Alan.W
- *  @date       29  DEC 2013
- *  @remark
- ***************************************************************************/
-
-#include "textquery.h"
-#include "queryresult.h"
-#include <iterator>
-#include <algorithm>
-#include <sstream>
-
-//! Constructor
-TextQuery::TextQuery(std::ifstream & is) : file(new std::vector<std::string>)
-{
-    //! each line
-    std::string line;
-    while(std::getline(is,line))
-    {
-        file->push_back(line);
-        //! current line index
-        int index = file->size() - 1;
-
-        //! for each word
-        std::stringstream lineSteam(line);
-        std::string word;
-        while(lineSteam >> word)
-        {
-            //! fetch the smart pointer which is null when the word first time seen
-            std::shared_ptr<
-                    std::set<index_Tp>>& sp_lineIndex = wm[word];
-
-            //! if null, allcate a new set to contain line indices
-            if(!sp_lineIndex)
-                sp_lineIndex.reset(new std::set<index_Tp>);
-
-            //! insert
-            sp_lineIndex->insert(index);
-        }
-    }
-
-    //!     =debugging=
-    std::cout << "@alan : the size of wm is " << wm.size() <<"\n";
-
-    for(const auto &line : *file)
-        std::cout<<"@alan : \t" << line << "\n";
-
-    /*
-    for(const auto &e : wm)
-    {
-        std::cout << e.first << " :\n";
-        for (const auto &index : *(e.second))
-        {
-            std::cout << index << " ";
-        }
-        std::cout << "\n";
-    }
-    */
-    //!      =end=
-}
-
-/**
- * @brief do a query opertion and return QueryResult object.
- */
-QueryResult
-TextQuery::query(const std::string &sought) const
-{
-    //! dynamicaly allocated set used for the word does not appear.
-    static std::shared_ptr<std::set<index_Tp>> noData(new std::set<index_Tp>);
-
-    //! fetch the iterator to the matching element in the map<word, lines>.
-    //std::map<std::string, std::shared_ptr<std::set<index_Tp>>>::const_iterator
-    auto iter = wm.find(sought);
-    if(iter == wm.end())
-        return QueryResult(sought, noData, file);
-    else
-        return QueryResult(sought, iter->second, file);
-}
-
-/**
- * @brief do a query opertion and return tuple.
- */
-result_tuple TextQuery::query_return_tuple(const std::string &sought)
-{
-    //! dynamicaly allocated set used for the word does not appear.
-    static std::shared_ptr<std::set<index_Tp>> noData(new std::set<index_Tp>);
-
-    //! fetch the iterator to the matching element in the map<word, lines>.
-    //std::map<std::string, std::shared_ptr<std::set<index_Tp>>>::const_iterator
-    auto iter = wm.find(sought);
-    if(iter == wm.end())
-        return result_tuple(sought, noData, file);
-    else
-        return result_tuple(sought, iter->second, file);
-}
-
diff --git a/ch17/ex17.3/textquery.h b/ch17/ex17.3/textquery.h
deleted file mode 100644
index 38f660b4..00000000
--- a/ch17/ex17.3/textquery.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/***************************************************************************
- *  @file       textqueryr.h
- *  @author     Alan.W
- *  @date       29  DEC 2013
- *  @remark
- ***************************************************************************/
-
-#ifndef TEXTQUERY_H
-#define TEXTQUERY_H
-
-#include <vector>
-#include <string>
-#include <fstream>
-#include <memory>
-#include <map>
-#include <set>
-
-class QueryResult;
-
-class TextQuery
-{
-
-public:
-    typedef std::vector<std::string>::size_type index_Tp;
-    typedef std::tuple <std::string,
-                        std::shared_ptr<std::set<index_Tp>>,
-                        std::shared_ptr<std::vector<std::string>>>  result_tuple;
-
-    //! constructor
-    TextQuery(std::ifstream&);
-
-    //! query operation returns QueryResult
-    QueryResult
-    query(const std::string&) const;
-
-    //! query operation returns tuple
-    result_tuple query_return_tuple(const std::string& sought);
-private:
-    std::shared_ptr<std::vector<std::string>> file;
-    std::map<std::string,
-             std::shared_ptr<std::set<index_Tp>>> wm;
-};
-
-#endif // TEXTQUERY_H