diff --git a/ch08/README.md b/ch08/README.md
index e7b6d391..d9191b5a 100644
--- a/ch08/README.md
+++ b/ch08/README.md
@@ -22,3 +22,7 @@ while (cin >> i) /*  ...    */
 ```
 
 putting `cin` in an error state cause to terminate. such as `eofbit`, `failbit` and `badbit`.
+
+## [Exercise 8.4](ex8_04.cpp)
+## [Exercise 8.5](ex8_05.cpp)
+## [Exercise 8.6](ex8_06.cpp)
diff --git a/ch08/ex8_02.cpp b/ch08/ex8_02.cpp
index 326dd22f..957f686f 100644
--- a/ch08/ex8_02.cpp
+++ b/ch08/ex8_02.cpp
@@ -5,7 +5,7 @@
 //  Created by pezy on 11/27/14.
 //  Copyright (c) 2014 pezy. All rights reserved.
 //
-//  Test your function by calling it, passing cin as an argument
+//  @Brief  Test your function by calling it, passing cin as an argument
 
 #include <iostream>
 using std::istream;
diff --git a/ch08/ex8_04.cpp b/ch08/ex8_04.cpp
new file mode 100644
index 00000000..01430f04
--- /dev/null
+++ b/ch08/ex8_04.cpp
@@ -0,0 +1,37 @@
+//
+//  ex8_04.cpp
+//  Exercise 8.4
+//
+//  Created by pezy on 11/9/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  @Brief  Write a function to open a file for input and read its contents into a vector of strings, 
+//          storing each line as a separate element in the vector. 
+
+#include <fstream>
+#include <string>
+#include <vector>
+#include <iostream>
+
+using std::vector; using std::string; using std::ifstream; using std::cout; using std::endl;
+
+void ReadFileToVec(const string& fileName, vector<string>& vec)
+{
+    ifstream ifs(fileName);
+    if (ifs)
+    {
+        string buf;
+        while (std::getline(ifs, buf))
+            vec.push_back(buf);
+    }
+}
+
+int main()
+{
+    vector<string> vec;
+    ReadFileToVec("../data/book.txt", vec);
+    for (const auto &str : vec)
+        cout << str << endl;
+    return 0;
+}
+
diff --git a/ch08/ex8_05.cpp b/ch08/ex8_05.cpp
new file mode 100644
index 00000000..b54658e3
--- /dev/null
+++ b/ch08/ex8_05.cpp
@@ -0,0 +1,37 @@
+//
+//  ex8_05.cpp
+//  Exercise 8.5
+//
+//  Created by pezy on 11/9/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  @Brief  Rewrite the previous program to store each word in a separate element.
+//  @See    ex8_04.cpp 
+
+#include <fstream>
+#include <string>
+#include <vector>
+#include <iostream>
+
+using std::vector; using std::string; using std::ifstream; using std::cout; using std::endl;
+
+void ReadFileToVec(const string& fileName, vector<string>& vec)
+{
+    ifstream ifs(fileName);
+    if (ifs)
+    {
+        string buf;
+        while (ifs >> buf)
+            vec.push_back(buf);
+    }
+}
+
+int main()
+{
+    vector<string> vec;
+    ReadFileToVec("../data/book.txt", vec);
+    for (const auto &str : vec)
+        cout << str << endl;
+    return 0;
+}
+
diff --git a/ch08/ex8_06.cpp b/ch08/ex8_06.cpp
new file mode 100644
index 00000000..afd0023c
--- /dev/null
+++ b/ch08/ex8_06.cpp
@@ -0,0 +1,47 @@
+//
+//  ex8_06.cpp
+//  Exercise 8.6
+//
+//  Created by pezy on 11/27/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  @Brief  Rewrite the bookstore program from ¡ì7.1.1 (p.256) to read its transactions from a file. 
+//          Pass the name of the file as an argument to main (¡ì6.2.5, p.218). 
+//  @See    ex7_26.h (use the Sales_data)
+//  @Run    give a parameter: "../data/book.txt"
+//  @Output 0-201-78345-X 5 110
+//          0-201-78346-X 9 839.2 
+
+#include <fstream>
+#include <iostream>
+
+#include "../ch07/ex7_26.h"
+using std::ifstream; using std::cout; using std::endl; using std::cerr;
+
+int main(int argc, char **argv)
+{
+    ifstream input(argv[1]);
+    
+    Sales_data total;
+    if (read(input, total))
+    {
+        Sales_data trans;
+        while (read(input, trans))
+        {
+            if (total.isbn() == trans.isbn())
+                total.combine(trans);
+            else
+            {
+                print(cout, total) << endl;
+                total = trans;
+            }
+        }
+        print(cout, total) << endl;
+    }
+    else
+    {
+        cerr << "No data?!" << endl;
+    }
+    
+    return 0;
+}
diff --git a/ch08/ex8_4_5.cpp b/ch08/ex8_4_5.cpp
deleted file mode 100644
index 737fd761..00000000
--- a/ch08/ex8_4_5.cpp
+++ /dev/null
@@ -1,83 +0,0 @@
-//! @Alan
-//!
-//! Exercise 8.4:
-//! Write a function to open a file for input and read its contents into a vector
-//! of strings, storing each line as a separate element in the vector.
-//  Note: the txt file must be placed at the folder of the exe file rather than the
-//  source file.
-//!
-//! Exercise 8.5:
-//! Rewrite the previous program to store each word in a separate element.
-//!
-#include <iostream>
-#include <string>
-#include <fstream>
-#include <vector>
-
-std::vector<std::string> &ex84(const std::string &fn, std::vector<std::string> &v);
-std::vector<std::string> &ex85(const std::string &fn, std::vector<std::string> &v);
-
-int main()
-{
-    std::vector<std::string> v;
-    ex84("test.txt",v);
-    std::cout << v[0] <<std::endl;
-
-
-    std::vector<std::string> w;
-    w = ex85("test.txt",w);
-
-    for (std::vector<std::string>::iterator it = w.begin(); it != w.end();  ++it)
-    {
-        std::cout<<*it;
-    }
-
-    return 0;
-}
-
-std::vector<std::string> &ex85(const std::string &fn, std::vector<std::string> &v)
-{
-    std::string word;
-    std::ifstream fin(fn);
-
-    if(fin.is_open())
-    {
-        std::cout<<"opened\n";
-    }
-    else
-    {
-        std::cout<<"failed\n";
-    }
-
-    while(fin>>word)
-    {
-        v.push_back(word);
-    }
-
-    return v;
-}
-
-
-std::vector<std::string> &ex84(const std::string &fn, std::vector<std::string> &v)
-{
-    std::string line;
-    std::ifstream fin(fn);
-
-    if(fin.is_open())
-    {
-        std::cout<<"opened\n";
-    }
-    else
-    {
-        std::cout<<"failed\n";
-    }
-
-    while(std::getline(fin,line))
-    {
-        v.push_back(line);
-    }
-
-    return v;
-}
-
-