diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..8f48b1d
Binary files /dev/null and b/.DS_Store differ
diff --git a/chapt1/.DS_Store b/chapt1/.DS_Store
new file mode 100644
index 0000000..3d22b93
Binary files /dev/null and b/chapt1/.DS_Store differ
diff --git a/chapt1/1_01.cpp b/chapt1/1_01.cpp
new file mode 100644
index 0000000..5ba2d0b
--- /dev/null
+++ b/chapt1/1_01.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+int main()
+{
+    string user_name;
+
+    cout << "Please enter your first name: ";
+    cin >> user_name;
+    cout << "\nHello, " << "Hello,  " << user_name << " ... and goodbye!\n";
+
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/1_02.cpp b/chapt1/1_02.cpp
new file mode 100644
index 0000000..4f9bc7e
--- /dev/null
+++ b/chapt1/1_02.cpp
@@ -0,0 +1,97 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+int main(void)
+{
+    string user_name;
+    int user_guess;
+    int num_tries;              // 总的猜测数
+    int num_right;              // 总的正确数
+    double user_score = 0.0;
+    char user_rsp;
+    char try_again;
+    bool next_seq = true;       // 显示下一组数列 
+    bool go_for_it = true;      // 用户想继续猜一次
+    bool got_it = false;         // 用户是否猜对 
+    const int max_tries = 3;
+
+    const int seq_size = 18;
+    const int max_seq = 6;
+    int elem_seq[seq_size] = {
+        1, 2, 3,    // Fibonacci
+        3, 4, 7,    // Lucas
+        2, 5, 12,   // Pell
+        3, 6, 10,   // Triangular
+        4, 9, 16,   // Square
+        5, 12, 22   // Pentagonal
+    };
+    string seq_names[max_seq] = {
+        "Fibonacci",
+        "Lucas",
+        "Pell",
+        "Triangular",
+        "Square",
+        "Pentagonal"
+    };
+    int cur_index = 0;
+
+
+    // 用户想要继续猜某个数列
+    while (next_seq == true && cur_index < seq_size)
+    {
+        // 显示数列的前两个数字
+        std::cout << "The first 2 elements of the sequence are: "
+                    << elem_seq[cur_index] << ", " << elem_seq[cur_index+1] << endl;
+        std::cout << "What is the next element?";
+        int tries_cnt = 0;
+        next_seq = true;
+        go_for_it = true;
+        got_it = false;
+        // 用户所猜不正确 && 用户想要再猜一次
+        while(!got_it && go_for_it && (++tries_cnt <= max_tries))
+        {
+            std::cin >> user_guess;
+            ++num_tries;
+            //  如果答案正确
+            if(user_guess == elem_seq[cur_index+2])
+            {
+                ++num_right;
+                std::cout << "Very good, yes, " << elem_seq[cur_index+2]
+                            << " is the next element in the "
+                            << seq_names[cur_index/3] << "  sequence." << endl;
+                got_it = true;
+            }else{
+            // 如果答案错误
+                switch (tries_cnt)
+                {
+                case 1:
+                    std::cout << "Oops, Nice guess but not quite it." << endl;
+                    break;
+                case 2:
+                    std::cout << "Sorry, Wrong a second time!" << endl;
+                    break;
+                case 3:
+                    std::cout << "Ah, this is harder than it looks, isn't it?" << endl;
+                    break;
+                default:
+                    std::cout << "It must be getting pretty frustrating by now!!!" << endl;
+                    break;
+                }
+
+                std::cout << "do you want to continue?(y/n):" << endl;
+                std::cin >> user_rsp;
+                if(user_rsp == 'N' || user_rsp == 'n')
+                    go_for_it = false;
+            } 
+        } // 内层while结束
+        std::cout  << "Want to try another sequence? (y/n)?" << endl;
+        std::cin >> try_again;
+        if(try_again == 'N' || try_again == 'n')
+            next_seq = false;
+        else
+            cur_index += 3;
+    }   // 外层while结束
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/1_03.cpp b/chapt1/1_03.cpp
new file mode 100644
index 0000000..94cd206
--- /dev/null
+++ b/chapt1/1_03.cpp
@@ -0,0 +1,20 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+int main()
+{
+    const int seq_size = 18;
+    vector<int> pell_seq(seq_size);
+    pell_seq[0] = 1;
+    pell_seq[1] = 2;
+    for (int index = 2; index < seq_size; index++)
+        pell_seq[index] = 2 * pell_seq[index-1] + pell_seq[index-2];
+    
+    cout << "The first " << pell_seq.size() << " elements of the Pell series:" << endl;
+    for (int index = 0; index < seq_size; index++)
+        cout << pell_seq[index] << " ";
+    cout << endl;
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/1_04.cpp b/chapt1/1_04.cpp
new file mode 100644
index 0000000..2082eda
--- /dev/null
+++ b/chapt1/1_04.cpp
@@ -0,0 +1,112 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+using namespace std;
+
+int main(void)
+{
+    string user_name;
+    int user_guess;
+    int num_tries;              // 总的猜测数
+    int num_right;              // 总的正确数
+    double user_score = 0.0;
+    char user_rsp;
+    char try_again;
+    bool next_seq = true;       // 显示下一组数列 
+    bool go_for_it = true;      // 用户想继续猜一次
+    bool got_it = false;         // 用户是否猜对 
+    const int max_tries = 3;
+
+    const int seq_size = 18;
+    int elem_seq[seq_size] = {
+        1, 2, 3,    // Fibonacci
+        3, 4, 7,    // Lucas
+        2, 5, 12,   // Pell
+        3, 6, 10,   // Triangular
+        4, 9, 16,   // Square
+        5, 12, 22   // Pentagonal
+    };
+    vector<int> fibonacci(elem_seq, elem_seq+3);
+    vector<int> Lucas(elem_seq+3, elem_seq+6);
+    vector<int> Pell(elem_seq+6, elem_seq+9);
+    vector<int> Triangular(elem_seq+9, elem_seq+12);
+    vector<int> Square(elem_seq+12, elem_seq+15);
+    vector<int> Pentagonal(elem_seq+15, elem_seq+18);
+
+    const int max_seq = 6;
+    string seq_names[max_seq] = {
+        "Fibonacci",
+        "Lucas",
+        "Pell",
+        "Triangular",
+        "Square",
+        "Pentagonal"
+    };
+    vector<int> * seq_addrs[max_seq] = {
+        &fibonacci, &Lucas, &Pell,
+        &Triangular, &Square, &Pentagonal
+    };
+
+    vector<int> *current_vec = 0;
+    int seq_index;
+    srand(time(NULL));
+
+    // 用户想要继续猜某个数列
+    while (next_seq == true)
+    {
+        seq_index = rand() % max_seq;
+        current_vec = seq_addrs[seq_index];
+        std::cout << "The first 2 elements of the sequence are: "
+                    << (*current_vec)[0] << ", " <<  (*current_vec)[1] << endl;
+        std::cout << "What is the next element?";
+        int tries_cnt = 0;
+        next_seq = true;
+        go_for_it = true;
+        got_it = false;
+        // 用户所猜不正确 && 用户想要再猜一次
+        while(!got_it && go_for_it && (++tries_cnt <= max_tries))
+        {
+            std::cin >> user_guess;
+            ++num_tries;
+            //  如果答案正确
+            if(user_guess ==  (*current_vec)[2])
+            {
+                ++num_right;
+                std::cout << "Very good, yes, " <<   (*current_vec)[2]
+                            << " is the next element in the "
+                            << seq_names[seq_index] << "  sequence." << endl;
+                got_it = true;
+            }else{
+            // 如果答案错误
+                switch (tries_cnt)
+                {
+                case 1:
+                    std::cout << "Oops, Nice guess but not quite it." << endl;
+                    break;
+                case 2:
+                    std::cout << "Sorry, Wrong a second time!" << endl;
+                    break;
+                case 3:
+                    std::cout << "Ah, this is harder than it looks, isn't it?" << endl;
+                    break;
+                default:
+                    std::cout << "It must be getting pretty frustrating by now!!!" << endl;
+                    break;
+                }
+
+                std::cout << "do you want to continue?(y/n):" << endl;
+                std::cin >> user_rsp;
+                if(user_rsp == 'N' || user_rsp == 'n')
+                    go_for_it = false;
+            } 
+        } // 内层while结束
+        std::cout  << "Want to try another sequence? (y/n)?" << endl;
+        std::cin >> try_again;
+        if(try_again == 'N' || try_again == 'n')
+            next_seq = false;
+    }   // 外层while结束
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/1_05.cpp b/chapt1/1_05.cpp
new file mode 100644
index 0000000..7a28e95
--- /dev/null
+++ b/chapt1/1_05.cpp
@@ -0,0 +1,28 @@
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+int main()
+{
+    string name;
+    int num_tries;
+    int num_rights;
+    ofstream outfile("1_05.txt", ios_base::app);
+
+    cout << "Enter your name: ";
+    cin >> name;
+    cout << "Enter your num_tries, num_rights: ";
+    cin >> num_tries >>num_rights;
+    if (!outfile)
+    {
+        cerr << "Oops, unable to save session data!" << endl;
+    }else
+    {
+        outfile << name << ' ' 
+                << num_tries << ' ' 
+                << num_rights << ' ' << endl;
+    }
+    
+
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/1_06.cpp b/chapt1/1_06.cpp
new file mode 100644
index 0000000..89e7173
--- /dev/null
+++ b/chapt1/1_06.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+int main()
+{
+    string name;
+    int num_tries;
+    int num_rights;
+    ifstream infile("1_05.txt");
+
+    if (!infile)
+    {
+        cerr << "Oops, unable to open file!" << endl;
+    }else
+    {
+        infile >> name >> num_tries >> num_rights;
+        cout << "name: " << name << endl;
+        cout << "tot: " << num_tries << endl;
+        cout << "right: " << num_rights << endl;
+    }
+    
+
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/1_07.cpp b/chapt1/1_07.cpp
new file mode 100644
index 0000000..672bab6
--- /dev/null
+++ b/chapt1/1_07.cpp
@@ -0,0 +1,34 @@
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+int main()
+{
+    string name;
+    int num_tries;
+    int num_rights;
+
+    fstream iofile("data.txt", ios_base::in | ios_base::app);
+    if(!iofile)
+    {
+        cerr << "Oops, unable to open file!" << endl;
+
+    }else
+    {
+        iofile << "andy " << 10 << ' ' << 7 << endl;
+        cout << "______________________" << endl;
+        string usr_name;
+        int num_tries = 0;
+        int num_rights = 0;
+        
+        // 由于ios_base::app的原因，开始读取之前，请将文件重新定位到起始处
+        iofile.seekg(0);
+        iofile >> usr_name >> num_tries >> num_rights;
+        cout << "name: " << usr_name << endl;
+        cout << "tot: " << num_tries << endl;
+        cout << "right: " << num_rights << endl;
+    }
+    
+
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/1_08.cpp b/chapt1/1_08.cpp
new file mode 100644
index 0000000..c7a6f4f
--- /dev/null
+++ b/chapt1/1_08.cpp
@@ -0,0 +1,154 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+#include <fstream>
+using namespace std;
+
+int main(void)
+{
+    string user_name;
+    int user_guess;
+    int num_tries;              // 总的猜测数
+    int num_right;              // 总的正确数
+    double user_score = 0.0;
+    char user_rsp;
+    char try_again;
+    bool next_seq = true;       // 显示下一组数列 
+    bool go_for_it = true;      // 用户想继续猜一次
+    bool got_it = false;         // 用户是否猜对 
+    const int max_tries = 3;
+
+    const int seq_size = 18;
+    int elem_seq[seq_size] = {
+        1, 2, 3,    // Fibonacci
+        3, 4, 7,    // Lucas
+        2, 5, 12,   // Pell
+        3, 6, 10,   // Triangular
+        4, 9, 16,   // Square
+        5, 12, 22   // Pentagonal
+    };
+    vector<int> fibonacci(elem_seq, elem_seq+3);
+    vector<int> Lucas(elem_seq+3, elem_seq+6);
+    vector<int> Pell(elem_seq+6, elem_seq+9);
+    vector<int> Triangular(elem_seq+9, elem_seq+12);
+    vector<int> Square(elem_seq+12, elem_seq+15);
+    vector<int> Pentagonal(elem_seq+15, elem_seq+18);
+
+    const int max_seq = 6;
+    string seq_names[max_seq] = {
+        "Fibonacci",
+        "Lucas",
+        "Pell",
+        "Triangular",
+        "Square",
+        "Pentagonal"
+    };
+    vector<int> * seq_addrs[max_seq] = {
+        &fibonacci, &Lucas, &Pell,
+        &Triangular, &Square, &Pentagonal
+    };
+
+    vector<int> *current_vec = 0;
+    int seq_index;
+
+    srand(time(NULL));
+    cout << "Enter your name: ";
+    cin >> user_name;
+    ifstream infile("seq_data.txt");
+    if(!infile)
+        cerr << "Oops, unable to open file!" << endl;
+    else
+    {
+        string name;
+        int nt;         // 猜的总次数
+        int nc;         // 猜对的次数
+        int find = 0;
+        while (infile >> name)
+        {
+            infile >> nt >> nc;
+            if(name == user_name)
+            {
+                find = 1;
+                num_tries = nt;
+                num_right = nc;
+            }
+        }  
+        if(find == 1){
+        cout << "Welcome back, " << user_name
+            << "TOT[" << nt << "]" 
+            << "RIGHT[" << nc << "]" 
+            << "\nGood, Luck!" << endl;
+        }else
+            cout << "Welcome, freshman " << user_name << endl;
+    }
+
+    // 用户想要继续猜某个数列
+    while (next_seq == true)
+    {
+        seq_index = rand() % max_seq;
+        current_vec = seq_addrs[seq_index];
+        std::cout << "The first 2 elements of the sequence are: "
+                    << (*current_vec)[0] << ", " <<  (*current_vec)[1] << endl;
+        std::cout << "What is the next element?";
+        int tries_cnt = 0;
+        next_seq = true;
+        go_for_it = true;
+        got_it = false;
+        // 用户所猜不正确 && 用户想要再猜一次
+        while(!got_it && go_for_it && (++tries_cnt <= max_tries))
+        {
+            std::cin >> user_guess;
+            ++num_tries;
+            //  如果答案正确
+            if(user_guess ==  (*current_vec)[2])
+            {
+                ++num_right;
+                std::cout << "Very good, yes, " <<   (*current_vec)[2]
+                            << " is the next element in the "
+                            << seq_names[seq_index] << "  sequence." << endl;
+                got_it = true;
+            }else{
+            // 如果答案错误
+                switch (tries_cnt)
+                {
+                case 1:
+                    std::cout << "Oops, Nice guess but not quite it." << endl;
+                    break;
+                case 2:
+                    std::cout << "Sorry, Wrong a second time!" << endl;
+                    break;
+                case 3:
+                    std::cout << "Ah, this is harder than it looks, isn't it?" << endl;
+                    break;
+                default:
+                    std::cout << "It must be getting pretty frustrating by now!!!" << endl;
+                    break;
+                }
+
+                std::cout << "do you want to continue?(y/n):" << endl;
+                std::cin >> user_rsp;
+                if(user_rsp == 'N' || user_rsp == 'n')
+                    go_for_it = false;
+            } 
+        } // 内层while结束
+        std::cout  << "Want to try another sequence? (y/n)?" << endl;
+        std::cin >> try_again;
+        if(try_again == 'N' || try_again == 'n')
+            next_seq = false;
+    }   // 外层while结束
+
+    ofstream outfile("seq_data.txt", ios_base::app);
+    if(!outfile)
+        cerr << "Oops, unable to open file!" << endl;
+    else
+    {
+        outfile << user_name << ' '
+                << num_tries << ' ' 
+                << num_right << endl;
+    }
+    
+    
+    return 0;
+}
\ No newline at end of file
diff --git "a/chapt1/C++\347\274\226\347\250\213\345\237\272\347\241\200.txt" "b/chapt1/C++\347\274\226\347\250\213\345\237\272\347\241\200.txt"
new file mode 100644
index 0000000..61ccbce
--- /dev/null
+++ "b/chapt1/C++\347\274\226\347\250\213\345\237\272\347\241\200.txt"
@@ -0,0 +1,28 @@
+p205 附录A
+p255 附录B
+
+01  什么是class
+    用户自定义的数据类型（user-defined data type），增强类型抽象化的层次
+    class定义应该分为两部分
+    （1）头文件（header file）——用来声明该class的各种操作行为
+    （2）代码文件（program text）——包含了操作行为的具体实现
+
+02  对象初始化方式
+    （1）使用=运算符，如int num_tries = 0
+        源自C语言
+    （2）构造函数语法，如int num_right(0)
+        解决“多值初始化”问题
+        使内置类型与class类型的初始化方式得到统一
+
+03  vector的定义
+    （1）包含vector头文件
+    （2）类名后尖括号内指定元素类型，vector的大小写在变量名后的小括号内，
+        如vector<int> vec_name(vec_size);
+
+04  文件读写
+    （0）包含头文件fstream
+    （1）若写文件，则创建ofstream对象
+        如ofstream outfile("filename");则以覆盖的方式写文件
+        若ofstream outfile("filename", ios_base::app);则以追加的方式写文件
+    （2）若读文件，则创建ifstream对象
+        如ifstream infile("filename");
\ No newline at end of file
diff --git a/chapt1/exe1.6.cpp b/chapt1/exe1.6.cpp
new file mode 100644
index 0000000..65b14a9
--- /dev/null
+++ b/chapt1/exe1.6.cpp
@@ -0,0 +1,19 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+int main(void)
+{
+    vector<int> ivec;
+    int ival;
+    int sum = 0;
+
+    while(cin >> ival)
+        ivec.push_back(ival);
+
+    for (int index = 0; index < ivec.size(); index++)
+        sum += ivec[index];
+    cout << "sum = " << sum << endl;
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/exe1.7.cpp b/chapt1/exe1.7.cpp
new file mode 100644
index 0000000..a217b2f
--- /dev/null
+++ b/chapt1/exe1.7.cpp
@@ -0,0 +1,32 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <fstream>
+#include <string>
+using namespace std;
+
+int main(void)
+{
+    ifstream infile("string.txt");
+    ofstream outfile("string_sort.txt");
+    if(!infile || !outfile)
+        cerr << "Unable to open file" << endl;
+    else
+    {
+        string words;
+        vector<string> text_vec;
+        while(infile >> words)
+            text_vec.push_back(words);
+        int index = 0;
+        cout << "Unsorted text: " << endl;
+        for(index = 0; index < text_vec.size(); index++)
+            cout <<text_vec[index] << endl;
+        
+        sort(text_vec.begin(), text_vec.end());
+        
+        for(index = 0; index < text_vec.size(); index++)
+            outfile <<text_vec[index] << endl;
+        
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/chapt1/string.txt b/chapt1/string.txt
new file mode 100644
index 0000000..78b5edc
--- /dev/null
+++ b/chapt1/string.txt
@@ -0,0 +1,5 @@
+andy
+hsu
+andy hello
+world
+abc
\ No newline at end of file
diff --git a/chapt1/string_sort.txt b/chapt1/string_sort.txt
new file mode 100644
index 0000000..52e386c
--- /dev/null
+++ b/chapt1/string_sort.txt
@@ -0,0 +1,6 @@
+abc
+andy
+andy
+hello
+hsu
+world