🍷 Finished ch8

1. ex8_02 should print, fixed.
2. added ex8_09 ex8_11 and ex8_13 cpp file.
3. move data file to `data` folder.
4. simplify @Mooophy's codes.

ch08/README.md

@@ -7,7 +7,8 @@
 istream& func(istream &is)
 {
     std::string buf;
-    while (is >> buf);
+    while (is >> buf)
+        std::cout << buf << std::endl;
     is.clear();
     return is;
 }
@@ -28,3 +29,19 @@ putting `cin` in an error state cause to terminate. such as `eofbit`, `failbit`
 ## [Exercise 8.6](ex8_06.cpp)
 ## [Exercise 8.7](ex8_07.cpp)
 ## [Exercise 8.8](ex8_08.cpp)
+## [Exercise 8.9](ex8_09.cpp)
+## [Exercise 8.10](ex8_10.cpp)
+## [Exercise 8.11](ex8_11.cpp)
+
+## Exercise 8.12:
+>Why didn’t we use in-class initializers in PersonInfo?
+
+Cause we need a aggregate class here. so it should have no in-class initializers.
+
+## [Exercise 8.13](ex8_13.cpp)
+
+## Exercise 8.14:
+>Why did we declare entry and nums as const auto &?
+
+- cause they are all class type, not the built-in type. so **reference** more effective.
+- output shouldn't change their values. so we added the `const`.

ch08/ex8_02.cpp

@@ -13,7 +13,8 @@ using std::istream;
 istream& func(istream &is)
 {
     std::string buf;
-    while (is >> buf);
+    while (is >> buf)
+        std::cout << buf << std::endl;
     is.clear();
     return is;
 }

ch08/ex8_09.cpp

@@ -0,0 +1,29 @@
+//
+//  ex8_09.cpp
+//  Exercise 8.9
+//
+//  Created by pezy on 11/29/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  @Brief  Use the function you wrote for the first exercise in § 8.1.2 (p.314) to print the contents of an istringstream object.
+//  @See    Exercise 8.1
+
+#include <iostream>
+#include <sstream>
+using std::istream;
+
+istream& func(istream &is)
+{
+    std::string buf;
+    while (is >> buf)
+        std::cout << buf << std::endl;
+    is.clear();
+    return is;
+}
+
+int main()
+{
+    std::istringstream iss("hello");
+    func(iss);
+    return 0;
+}

ch08/ex8_10.cpp

@@ -1,83 +1,42 @@
-//! @Alan
-//!
-//! Exercise 8.10:
-//! Write a program to store each line from a file in a vector<string>.
-//! Now use an istringstream to read each element from the vector a word at a time.
-//!
-//!
-
+//
+//  ex8_10.cpp
+//  Exercise 8.10
+//
+//  Created by pezy on 11/29/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  @Brief  Write a program to store each line from a file in a vector<string>.
+//          Now use an istringstream to read each element from the vector a word at a time.
 
 #include <iostream>
-#include <string>
 #include <fstream>
 #include <sstream>
 #include <vector>
+#include <string>
 
+using std::vector; using std::string; using std::ifstream; using std::istringstream; using std::cout; using std::endl; using std::cerr;
 
-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);
-
-//! Exercise 8.10
 int main()
 {
-    std::vector<std::string> v;
-    v = ex84("test.txt", v);
-    for (std::vector<std::string>::iterator it = v.begin(); it != v.end(); ++it)
-    {
-        std::istringstream sfin(*it);
-        std::string s;
-        while(sfin>>s)
-        {
-            std::cout<<s;
-        }
-
-    }
-    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
+    ifstream ifs("../data/book.txt");
+    if (!ifs)
     {
-        std::cout<<"failed\n";
+        cerr << "No data?" << endl;
+        return -1;
     }
-
-    while(std::getline(fin,line))
+
+    vector<string> vecLine;
+    string line;
+    while (getline(ifs, line))
+        vecLine.push_back(line);
+
+    for (auto &s : vecLine)
     {
-        v.push_back(line);
+        istringstream iss(s);
+        string word;
+        while (iss >> word)
+            cout << word << endl;
     }
-
-    return v;
+    
+    return 0;
 }
-
-

ch08/ex8_11.cpp

@@ -0,0 +1,48 @@
+//
+//  ex8_11.cpp
+//  Exercise 8.11
+//
+//  Created by pezy on 11/29/14.
+//  Copyright (c) 2014 pezy. All rights reserved.
+//
+//  @Brief  The program in this section defined its istringstream object inside the outer while loop.
+//          What changes would you need to make if record were defined outside that loop?
+//          Rewrite the program, moving the definition of record outside the while, and see whether you thought of all the changes that are needed.
+
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <vector>
+using std::vector; using std::string; using std::cin; using std::istringstream;
+
+struct PersonInfo {
+    string name;
+    vector<string> phones;
+};
+
+int main()
+{
+    string line, word;
+    vector<PersonInfo> people;
+    istringstream record;
+    while (getline(cin, line))
+    {
+        PersonInfo info;
+        record.clear();
+        record.str(line);
+        record >> info.name;
+        while (record >> word)
+            info.phones.push_back(word);
+        people.push_back(info);
+    }
+
+    for (auto &p : people)
+    {
+        std::cout << p.name << " ";
+        for (auto &s : p.phones)
+            std::cout << s << " ";
+        std::cout << std::endl;
+    }
+
+    return 0;
+}