diff --git "a/04.c++14/01.\346\225\260\345\255\227\345\210\206\351\232\224\347\254\246.cpp" "b/04.c++14/01.\346\225\260\345\255\227\345\210\206\351\232\224\347\254\246.cpp"
new file mode 100644
index 0000000..375b544
--- /dev/null
+++ "b/04.c++14/01.\346\225\260\345\255\227\345\210\206\351\232\224\347\254\246.cpp"
@@ -0,0 +1,13 @@
+#include <iostream>
+#include <chrono>
+using namespace std;
+
+int main()
+{
+	auto a = 1'234'567; // 1234567 整数
+	auto b = 1'234'56s; // 1234567秒 // std::chrono::milliseconds
+
+	cout << a << endl;
+	cout << b.count() << endl;
+	return 0;
+}
diff --git "a/04.c++14/02.\345\207\275\346\225\260\350\277\224\345\233\236\345\200\274\347\261\273\345\236\213\346\216\250\345\257\274.cpp" "b/04.c++14/02.\345\207\275\346\225\260\350\277\224\345\233\236\345\200\274\347\261\273\345\236\213\346\216\250\345\257\274.cpp"
new file mode 100644
index 0000000..a143635
--- /dev/null
+++ "b/04.c++14/02.\345\207\275\346\225\260\350\277\224\345\233\236\345\200\274\347\261\273\345\236\213\346\216\250\345\257\274.cpp"
@@ -0,0 +1,14 @@
+#include <iostream>
+using namespace std;
+
+template<typename T>
+auto func(T i)
+{
+	return i;
+}
+
+int main()
+{
+	cout << func("C++14") << endl;
+	return 0;
+}
\ No newline at end of file
diff --git a/04.c++14/03.auto.cpp b/04.c++14/03.auto.cpp
new file mode 100644
index 0000000..b37fa30
--- /dev/null
+++ b/04.c++14/03.auto.cpp
@@ -0,0 +1,10 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+
+	auto f = [](auto a) { return a; };
+
+	cout << f("c++14") << endl;
+	return 0;
+}
diff --git "a/04.c++14/04.\345\217\230\351\207\217\346\250\241\347\211\210.cpp" "b/04.c++14/04.\345\217\230\351\207\217\346\250\241\347\211\210.cpp"
new file mode 100644
index 0000000..e110eb9
--- /dev/null
+++ "b/04.c++14/04.\345\217\230\351\207\217\346\250\241\347\211\210.cpp"
@@ -0,0 +1,29 @@
+#include <iostream>
+using namespace std;
+
+template<class T>
+constexpr T pi = T(3.1415926535897932385L);
+
+template<typename T, typename U>
+struct A {
+   T t;
+   U u;
+};
+
+template<typename T>
+using B = A<T, int>;
+
+int main() {
+
+	cout << pi<int> << endl; // 3
+	cout << pi<double> << endl; // 3.14159
+
+
+	B<double> b;
+	b.t = 10;
+	b.u = 20;
+	cout << b.t << endl;
+	cout << b.u << endl;
+
+	return 0;
+}
diff --git a/04.c++14/05.constexpr.cpp b/04.c++14/05.constexpr.cpp
new file mode 100644
index 0000000..945f9f4
--- /dev/null
+++ b/04.c++14/05.constexpr.cpp
@@ -0,0 +1,8 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+
+	cout << "hello, world!" << endl;
+	return 0;
+}