diff --git a/c++ note/chp10/chapter 10.cpp b/c++ note/chp10/chapter 10.cpp
new file mode 100644
index 0000000..8b627b8
--- /dev/null
+++ b/c++ note/chp10/chapter 10.cpp	
@@ -0,0 +1,144 @@
+//Exercise 10.2
+#include <iostream>
+#include <algorithm>
+#include <list>
+#include <string>
+#define NUM 10
+using namespace std;
+int main(){
+	list<string> strList;
+	string tmp;
+	for (int ix = 0; ix != NUM; ix++) {
+		cin >> tmp;
+		strList.push_back(tmp);
+	}
+	string val;
+	cin >> val;
+	cout << count(strList.begin(), strList.end(), val) << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 10.3
+#include <vector>
+#include <iostream>
+#include <numeric>
+using namespace std;
+int main(){
+	vector<int> intVec{ 5,4,3,1,2 };
+	cout << accumulate(intVec.cbegin(), intVec.cend(), 0) << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 10.6
+#include <iostream>
+#include <iterator>
+#include <algorithm>
+#include <vector>
+#define NUM 10
+using namespace std;
+int main(){
+	vector<int> intVec;
+	fill_n(back_inserter(intVec), 10, 0);
+	for (auto It = intVec.cbegin(); It != intVec.cend(); It++)
+		cout << *It << ' ';
+	cout << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 10.9
+#include <algorithm>
+#include <string>
+#include <vector>
+#include <iostream>
+using namespace std;
+void print(vector<string> strVec);
+int main(){
+	vector<string> strVec;
+	string word;
+	while (cin >> word)
+		strVec.push_back(word);
+	print(strVec);
+	sort(strVec.begin(), strVec.end());
+	print(strVec);
+	auto unique_end = unique(strVec.begin(), strVec.end());
+	print(strVec);
+	strVec.erase(unique_end, strVec.end());
+	print(strVec);
+
+	system("pause");
+	return 0;
+}
+
+void print(vector<string> strVec){
+	if(!strVec.empty()){
+		for (auto It = strVec.cbegin(); It != strVec.cend(); It++)
+			cout << *It << ' ';
+	}
+	cout << endl;
+}
+
+//Exercise 10.13
+#include <iostream>
+#include <string>
+#include <algorithm>
+#include <vector>
+using namespace std;
+void print(vector<string> strVec);
+bool have_five_char(string word){
+	return word.size() >= 5;
+}
+int main(){
+	vector<string> words;
+	string word;
+	while (cin >> word)
+		words.push_back(word);
+	auto end = partition(words.begin(), words.end(), have_five_char);
+	print(words);
+	words.erase(end, words.end());
+	print(words);
+	system("pause");
+	return 0;
+}
+void print(vector<string> strVec) {
+	if (!strVec.empty()) {
+		for (auto It = strVec.cbegin(); It != strVec.cend(); It++)
+			cout << *It << ' ';
+	}
+	cout << endl;
+}
+
+//Exercise 10.14
+auto func = [](int a, int b){return a+b;};
+
+//Exercise 10.15
+int a = 42;
+auto func = [a](int b){return a+b;};
+
+//Exercise 10.20
+#include <iostream>
+#include <algorithm>
+#include <vector>
+#include <string>
+#define  LENGTH 6
+using namespace std;
+int main(){
+	vector<string> strVec;
+	string word;
+	while (cin >> word)
+		strVec.push_back(word);
+	auto count = count_if(strVec.cbegin(), strVec.cend(), [](string str) {return str.size() > LENGTH; });
+	cout << count << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 10.21
+auto func = [arg]() mutable ->bool{
+	if(arg == 0) return True;
+	//else
+	while(arg-- != 0);
+	return False;
+}
\ No newline at end of file
diff --git a/c++ note/chp7/exercise7_1.cpp b/c++ note/chp7/exercise7_1.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/c++ note/chp9/chapter 9.cpp b/c++ note/chp9/chapter 9.cpp
new file mode 100644
index 0000000..533537b
--- /dev/null
+++ b/c++ note/chp9/chapter 9.cpp	
@@ -0,0 +1,500 @@
+#include <list>
+#include <deque>
+
+//Exercise 9.2
+std::list<std::deque<int> > List;
+
+//Exercise 9.4
+using std::vector;
+bool find(vector<int>::iterator front, vector<int>::iterator behind, int target){
+	for(;front<behind;front++){
+		if(*front == target) return TRUE;
+	}
+	return FALSE;
+}
+
+//Exercise 9.5
+using std::vector;
+vector<int>::iterator find(vector<int>::iterator front, vector<int>::iterator behind, int target){
+	for(;front<behind;front++){
+		if(*front == target) return front;
+	}
+	return behind;
+}
+
+//Exercise 9.6
+while(iter1 < iter2)/* ... */  --> while(iter1 != iter2)/* ... */ 
+_list DO NOT support `<` operator_
+
+//Exercise 9.18
+#include <iostream>
+#include <string>
+#include <deque>
+using namespace std;
+int main(){
+	deque<string> strdq;
+	string currStr;
+	while(cin >> currStr){
+		strdq.push_back(currStr);
+	}
+	deque<string>::iterator dqIt;
+	for(dqIt = strdq.begin(); dqIt != strdq.end(); dqIt++){
+		cout << *dqIt;
+	}
+	return 0;
+}
+
+//Exercise 9.19
+#include <iostream>
+#include <string>
+#include <list>
+using namespace std;
+int main() {
+	list<string> strdq;
+	string currStr;
+	while (cin >> currStr) {
+		strdq.push_back(currStr);
+	}
+	list<string>::const_iterator dqIt;
+	for (dqIt = strdq.cbegin(); dqIt != strdq.cend(); dqIt++) {
+		cout << *dqIt << endl;
+	}
+
+	system("pause");
+	return 0;
+}
+
+//Exercise 9.20
+#include <iostream>
+#include <string>
+#include <list>
+#include <deque>
+using namespace std;
+int main(){
+	list<int> iList = {8,9,5,3,1,2,6,4,7,0};
+	deque<int> evendq, odddq;
+	for(auto listIt = iList.cbegin(); listIt != iList.cend(); listIt++){
+		//if odd
+		if(*listIt % 2) odddq.push_back(*listIt);
+		else            evendq.push_back(*listIt);
+	}
+
+	for(auto dqIt = odddq.cbegin(); dqIt != odddq.cend(); cout << *dqIt << ' ', dqIt++);
+	cout << endl;
+	for(auto dqIt = evendq.cbegin(); dqIt != evnedq.cend(); cout << *dqIt << ' ', dqIt++);
+	cout << endl;
+	
+	return 0;
+}
+
+//Exercise 9.24
+#include <stdexcept>
+#include <vector>
+#include <iostream>
+using namespace std;
+int main(){
+	vector<int> emptyVector;
+	try {
+		//cout << *emptyVector.begin() << endl;
+		//cout << emptyVector.front() << endl;
+		//cout << emptyVector[0] << endl;
+		cout << emptyVector.at(0) << endl;
+	}catch(out_of_range err){
+		cout << err.what() << endl;
+		cout << "Press to exit" << endl;
+		system("pause");
+	}
+	return 0;
+}
+
+//Exercise 9.26
+#include <vector>
+#include <list>
+#include <iostream>
+using namespace std;
+int	main(){
+	int ia[] = { 0, 1, 1, 2, 3, 5, 8, 13, 21, 55, 89 };
+	vector<int> ivec;
+	list<int>   ilst;
+	for(int i = 0; i != 11; i++){
+		ivec.push_back(ia[i]);
+		ilst.push_back(ia[i]);
+	}
+	for(auto vIt = ivec.begin(); vIt != ivec.end();){
+		if (*vIt % 2 == 0) vIt = ivec.erase(vIt); //even
+		else               vIt += 1;
+	}
+	for(auto lIt = ilst.begin(); lIt != ilst.end();){
+		if (*lIt % 2) lIt = ilst.erase(lIt);      // odd
+		else          lIt++;
+	}
+	cout << "result vector:" << endl;
+	for (auto It = ivec.begin(); It != ivec.end(); It++)
+		cout << *It << ' ';
+	cout << "\nresult list" << endl;
+	for (auto It = ilst.begin(); It != ilst.end(); It++)
+		cout << *It << ' ';
+	cout << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 9.27
+#include <vector>
+#include <forward_list>
+#include <iostream>
+using namespace std;
+int	main(){
+	forward_list<int>   ilst = { 0, 1, 1, 2, 3, 5, 8, 13, 21, 55, 89 };
+	auto lIt = ilst.begin();
+	auto prevlIt = ilst.before_begin();
+	for(; lIt != ilst.end();){
+		if (*lIt % 2) lIt = ilst.erase_after(prevlIt);      // odd
+		else{
+			lIt++, prevlIt++;
+		}
+	}
+	cout << "\nresult list" << endl;
+	for (auto It = ilst.begin(); It != ilst.end(); It++)
+		cout << *It << ' ';
+	cout << endl;
+	system("pause");
+	return 0;
+}
+
+
+//Exercise 9.28
+#include <forward_list>
+#include <iostream>
+#include <string>
+using namespace std;
+forward_list<string> insertStr(forward_list<string> src, string pos, string destStr);
+int main(){
+	forward_list<string> strLst = { "This", "is", "not", "TRUE", "happiness", "!" };
+	auto resultLst = insertStr(strLst, string("is"), string("true"));
+	for (auto It = resultLst.cbegin(); It != resultLst.cend(); It++)
+		cout << *It << ' ';
+	cout << endl;
+	system("pause");
+	return 0;
+}
+
+forward_list<string> insertStr(forward_list<string> src, string pos, string destStr){
+	auto It = src.begin();
+	auto prev = src.before_begin();
+	while(It != src.end()){
+		if (*It == pos) {
+			src.insert_after(It, destStr);
+			break;
+		}
+		++prev;
+		++It;
+	}
+	if (It == src.end())  src.insert_after(prev, destStr);
+	return src;
+}
+
+//Exercise 9.43
+#include <string>
+#include <iostream>
+using namespace std;
+string strReplace(string s, string oldVal, string newVal);
+string::iterator find(string &s, string dest, string::iterator start);
+int main(){
+	string src("thothothohelloworld"), oldVal("hell"), newVal("world");
+	src = strReplace(src, oldVal, newVal);
+	cout << src << endl;
+	system("pause");
+	return 0;
+}
+string strReplace(string s, string oldVal, string newVal){
+	auto pos = s.begin();
+	while (pos != s.end()) {
+		pos = find(s, oldVal, pos);
+		if (pos == s.end()) break;
+		pos = s.erase(pos, oldVal.size() + pos);
+		pos = s.insert(pos, newVal.begin(), newVal.end());
+		pos += newVal.size();
+	}
+	return s;
+}
+string::iterator find(string &s, string dest, string::iterator start){
+	string::iterator pos = start, local, tmp;
+	for(; pos <= s.end() - dest.size(); pos++){
+		tmp   = dest.begin();
+		local = pos;
+		while(*tmp == *local){
+			tmp++, local++;
+			if (tmp == dest.end()) return pos;
+		}
+	}
+	return s.end();
+}
+
+
+// Exercise 9.44
+#include <string>
+#include <iostream>
+using namespace std;
+string strReplace(string s, string oldVal, string newVal);
+int main(){
+	string src("thothotho"), oldVal("tho"), newVal("though");
+	src = strReplace(src, oldVal, newVal);
+	cout << src << endl;
+	system("pause");
+	return 0;
+}
+string strReplace(string s, string oldVal, string newVal){
+	string::size_type pos = 0;
+	while (pos != s.size()) {
+		pos = s.find(oldVal, pos);
+		if (pos == string::npos) break;
+		s.replace(pos, oldVal.size(), newVal);
+		pos += newVal.size();
+	}
+	return s;
+}
+
+//Exercise 9.45
+#include <iostream>
+#include <string>
+using namespace std;
+string completeName(string name, string prefix, string suffix);
+int main(){
+	string name, prefix, suffix;
+	cin >> name >> prefix >> suffix;
+	string fullname = completeNam(name, prefix, suffix);
+	cout << fullname << endl;
+	system("pause");
+	return 0;
+}
+string completeName(string name, string prefix, string suffix){
+	name.insert(name.begin(), prefix.begin(), prefix.end());
+	name.append(suffix);
+	return name;
+}
+
+//Exercise 9.46: using index and length, and insert function only
+string completeName(string name, string prefix, string suffix){
+	name.insert(0, prefix);
+	name.insert(name.size(), suffix);
+	return name;
+}
+
+//Exercise 9.47
+#include <iostream>
+#include <string>
+using namespace std;
+int main(){
+	string s("ab2c3d7R4E6");
+	string numbers("0123456789");
+	string::size_type pos = 0;
+	while((pos = s.find_first_of(numbers, pos)) != s.npos){
+		cout << s[pos] << ' ';
+		pos++;
+	}
+	cout << endl;
+	pos = 0;
+	while ((pos = s.find_first_not_of(numbers, pos)) != s.npos) {
+		cout << s[pos] << ' ';
+		pos++;
+	}
+	cout << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 9.49
+#include <iostream>
+#include <vector>
+#include <string>
+using namespace std;
+int main(){
+	string ascender("bdfhjklt"), descender("gjpqy");
+	string invalid(ascender.append(descender));
+	vector<string> text;
+	string word;
+	while(cin >> word){
+		text.push_back(word);
+	}
+	string::size_type maxlen = 0;
+	vector<string>::const_iterator pos;
+	for(auto It = text.cbegin();It != text.cend(); It++){
+		if((*It).find_first_of(invalid) == (*It).npos){
+			if ((*It).size() > maxlen) {
+				maxlen = (*It).size();
+				pos = It;
+			}
+		}
+	}
+	cout << *pos << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 9.50.a
+#include <iostream>
+#include <string>
+#include <vector>
+using namespace std;
+int main() {
+	int N;
+	cin >> N;
+	vector<string> s(N);
+	for (int ix = 0; ix != N; ix++)
+		cin >> s[ix];
+	int sum = 0;
+	for (auto It = s.cbegin(); It != s.cend(); It++) {
+		sum += stoi(*It);
+	}
+	cout << sum << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 9.50.b
+#include <iostream>
+#include <string>
+#include <vector>
+using namespace std;
+int main() {
+	int N;
+	cin >> N;
+	vector<string> s(N);
+	for (int ix = 0; ix != N; ix++)
+		cin >> s[ix];
+	double sum = 0;
+	for (auto It = s.cbegin(); It != s.cend(); It++) {
+		sum += stod(*It);
+	}
+	cout << sum << endl;
+	system("pause");
+	return 0;
+}
+
+//Exercise 9.51
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <vector>
+#define NUM_OF_MONTH 12 
+using namespace std;
+class date{
+private:
+	unsigned year;
+	unsigned month;
+	unsigned day;
+	const char* months[12]{"January", "February", "March", "April", "May", "June",
+						   "July", "August", "September", "October", "November", "December" };
+	const char* alphabet{ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" };
+public:
+	date(string strDate);
+	date();
+	unsigned get_year(){
+		return year;
+	}
+	//get_month();get_day();
+	void print_date(int format = 0);
+};
+
+//default constructor
+date::date(){
+	year  = 1998;
+	month = 1;
+	day   = 1;
+}
+
+//constructor taking a string
+date::date(string strDate){
+	string strMonth, strYear, strDay;
+	if (strDate.find(' ') != strDate.npos) {
+		strMonth = strDate.substr(0, strDate.find(' '));
+		int ix;
+		try {
+			for (ix = 0; ix != NUM_OF_MONTH; ix++) {
+				if (!strMonth.compare(months[ix]) || !strMonth.compare(string(months[ix], 3))) {
+					month = ix + 1;
+					break;
+				}
+			}
+			if (ix == NUM_OF_MONTH) throw runtime_error("input error: invalid month");
+			strYear = strDate.substr(strDate.size() - 4);
+			if (strYear.find_first_of(alphabet) != strYear.npos) throw runtime_error("input error: invalid year");
+			else year = stoi(strYear);
+			strDay = strDate.substr(strDate.find(' ') + 1, strDate.size() - 6);
+			if (strDay.find_first_of(alphabet) != strDay.npos) throw runtime_error("input error: invalid day");
+			else day = stoi(strDay);
+		}
+		catch(runtime_error err){
+			cout << err.what() << endl;
+			cout << "continue or not(y/n): ";
+			char c;
+			cin >> c;
+			if (c == 'n' || c == 'N') exit(0);
+		}
+	}else{//format 1/1/1998
+		try {
+			strMonth = strDate.substr(0, strDate.find('/'));
+			if (strMonth.find_first_of(alphabet) != strMonth.npos) throw runtime_error("input error: invalid month");
+			else month = stoi(strMonth);
+			strYear = strDate.substr(strDate.size() - 4);
+			if (strYear.find_first_of(alphabet) != strYear.npos) throw runtime_error("input error: invalid year");
+			else year = stoi(strYear);
+			strDay = strDate.substr(strDate.find('/') + 1, strDate.size() - 5);
+			if (strDay.find_first_of(alphabet) != strDay.npos) throw runtime_error("input error: invalid day");
+			else day = stoi(strDay);
+		}
+		catch(runtime_error err){
+			cout << err.what() << endl;
+			cout << "continue or not(y/n): ";
+			char c;
+			cin >> c;
+			if (c == 'n' || c == 'N') exit(0);
+		}
+	}
+}
+
+//print current date with various formats
+void date::print_date(int format){
+	switch(format){
+	default:
+	case 0:
+		cout << months[month-1] << ' ' << day << ", " << year << endl;;
+		break;
+	case 1:
+		cout << string(months[month-1], 3) << ' ' << day << ", " << year << endl;
+		break;
+	case 2:
+		cout << month << '/' << day << '/' << year << endl;
+		break;
+	}
+}
+
+//Exercise 9.52
+#include <iostream>
+#include <string>
+#include <stack>
+using namespace std;
+int main(){
+	string expr{ "This is (Mooophy(awesome)((((wooooooooo))))) and (ocxs) over" };
+	const char repl = '#';
+	stack<char> charStack;
+	int seen = 0;
+	for(auto It = expr.cbegin(); It != expr.cend(); It++){
+		charStack.push(*It);
+		if (*It == '(') seen += 1;
+		if(*It == ')' && seen > 0){
+			seen -= 1;
+			while (charStack.top() != '(') charStack.pop();
+			charStack.pop();
+			charStack.push(repl);
+		}
+	}
+	//output the result
+	string output;
+	for (; !charStack.empty(); charStack.pop())
+		output.insert(output.begin(), charStack.top());
+	cout << output << endl;
+	system("pause");
+	return 0;
+}
diff --git a/c++ note/common_bugs.md b/c++ note/common_bugs.md
new file mode 100644
index 0000000..120daa7
--- /dev/null
+++ b/c++ note/common_bugs.md	
@@ -0,0 +1,8 @@
+Some Common Bugs
+================
+
+为了更好的debug，我觉得还是有必要把平时出现的有点难度的bug记录下来，以让自己知道你自己写的究竟是些啥？？？
+
+> 在调用了构造函数，进行了必要的初始化，之后的操作却出现了空指针？
+
+因为我嵌套调用了构造函数。在构造函数中调用其他构造函数，只会产生一个匿名的对象，并不会帮助你初始化当前的对象。
\ No newline at end of file
diff --git a/c++ note/exception.md b/c++ note/exception.md
new file mode 100644
index 0000000..a2761be
--- /dev/null
+++ b/c++ note/exception.md	
@@ -0,0 +1,38 @@
+## exception
+
++ 基本结构`try-catch`
+
+	try{
+		expression	
+	}catch(errorType err){
+		expression
+	}catch(errorType err){
+		expression
+	}...
++ 文件支持
+	
+	#include <stdexcept>
+	//#include <exception>
+	using std::runtime_error
++ 具体使用方法
+	- try block内放可能会产生异常的语句，并抛出(throw)相应的异常
+
+	try{
+		if(...) throw runtime_error("fatal error: dividing zero");
+		if(...) throw ...
+		//else
+		normal expression
+	}
+	- 在catch中检查可能会出现的异常，若异常与catch的异常类型对应，则进入相应的异常处理程序
+
+	try{
+		...
+	}catch(runtime_error err){
+		cout << err.what() << endl;//err.what()返回抛出异常时初始化的字符串
+		//other handling
+		cout << "continue or not(y/n): ";
+		char c;
+		cin >> c;
+		if(c == 'n' || c == 'N') break;
+		//else continue
+	} 
\ No newline at end of file