diff --git a/201816040319/Ex03_13/Ex03_13.cpp b/201816040319/Ex03_13/Ex03_13.cpp
new file mode 100644
index 0000000..d169a4e
--- /dev/null
+++ b/201816040319/Ex03_13/Ex03_13.cpp
@@ -0,0 +1,37 @@
+// github 3.13
+// Invoice class definition.
+
+#include <iostream>
+using namespace std;
+
+#include "Invoice.h" // include definition of class Invoice
+
+// function main begins program execution
+int main()
+{
+    string Number;
+    string Style;
+    int    Sell;
+    int    Price;
+
+    cout <<"零件号："<<endl;
+    cin  >>Number;
+    cout <<"零件描述："<<endl;
+    cin  >>Style;
+    cout <<"销售总量："<<endl;
+    cin  >>Sell;
+    cout <<"单价："<<endl;
+    cin  >>Price;
+
+    Invoice invoice(Number,Style,Sell,Price);
+
+    cout <<"验证数据："<<invoice.getInvoiceNumber()<<"    "<<invoice.getInvoiceStyle()<<"    "<<invoice.getInvoiceSell()<<"    "<<invoice.getInvoicePrice()<<endl;
+
+    cout <<"计算数据："<<invoice.getInvoiceAmmount();
+
+    return 0;
+
+
+} // end main
+
+
diff --git a/201816040319/Ex03_13/Invoice.cpp b/201816040319/Ex03_13/Invoice.cpp
new file mode 100644
index 0000000..c61952f
--- /dev/null
+++ b/201816040319/Ex03_13/Invoice.cpp
@@ -0,0 +1,65 @@
+//  Invoice.cpp
+//  class member-function definitions.
+#include <iostream>
+using namespace std;Invoice
+
+#include "Invoice.h" // Invoice class definition
+
+
+Invoice::Invoice(string number,string style ,int sell ,int price )
+{
+    setInvoiceNumber(number);
+    setInvoiceStyle(style);
+    setInvoiceSell(sell);
+    setInvoicePrice(price);
+
+}
+  //Number
+    void   Invoice::setInvoiceNumber(string Number)
+    {
+        number=Number;
+    }
+    string Invoice::getInvoiceNumber()
+    {
+        return number;
+    }
+
+  //style
+    void   Invoice::setInvoiceStyle(string Style)
+    {
+        style=Style;
+    }
+    string Invoice::getInvoiceStyle()
+    {
+        return style;
+    }
+
+  //Sell
+    void   Invoice::setInvoiceSell(int Sell)
+    {
+        if(Sell<=0)
+            sell=0;
+        else
+            sell=Sell;
+    }
+    int    Invoice::getInvoiceSell()
+    {
+        return sell;
+    }
+  //price
+    void   Invoice::setInvoicePrice(int Price)
+    {
+        if(Price<=0)
+            price=0;
+        else
+            price=Price;
+    }
+    int    Invoice::getInvoicePrice()
+    {
+        return price;
+    }
+  //Ammount
+    int    Invoice::getInvoiceAmmount()
+    {
+        return sell*price;
+    }
diff --git a/201816040319/Ex03_13/Invoice.h b/201816040319/Ex03_13/Invoice.h
new file mode 100644
index 0000000..8c33d72
--- /dev/null
+++ b/201816040319/Ex03_13/Invoice.h
@@ -0,0 +1,29 @@
+// github 3.13
+// Invoice class definition.
+
+#include <string> // program uses C++ standard string class
+using namespace std;
+
+// Invoice class definition
+class Invoice
+{
+public:
+    Invoice(string number ,string style ,int sell ,int price );
+
+    void   setInvoiceNumber(string Number);
+    string getInvoiceNumber();
+    void   setInvoiceStyle(string Style);
+    string getInvoiceStyle();
+    void   setInvoiceSell(int Sell);
+    int    getInvoiceSell();
+    void   setInvoicePrice(int Price);
+    int    getInvoicePrice();
+    int    getInvoiceAmmount();
+
+private:
+    string number;
+    string style;
+    int    sell  ;
+    int    price;
+
+}; // end class Invoice
diff --git a/201816040319/Ex03_15/Date.cpp b/201816040319/Ex03_15/Date.cpp
new file mode 100644
index 0000000..2b9bd26
--- /dev/null
+++ b/201816040319/Ex03_15/Date.cpp
@@ -0,0 +1,49 @@
+
+// Date class member-function definitions.
+#include <iostream>
+using namespace std;
+
+#include "Date.h" // Date class definition
+
+Date::Date(int month,int day,int year)
+{
+
+    setDateMonth(month);
+    setDateDay(day);
+    setDateYear(year);
+}
+//Year
+void Date::setDateYear(int Year)
+{
+    year=Year;
+}
+int Date::getDateYear()
+{
+    return year;
+}
+//Month
+void Date::setDateMonth(int Month)
+{
+    if(Month>=13)
+        month=1;
+    else
+      month=Month;
+}
+int Date::getDateMonth()
+{
+    return month;
+}
+//Day
+void Date::setDateDay(int Day)
+{
+    day=Day;
+}
+int Date::getDateDay()
+{
+    return day;
+}
+
+void Date::getdisplayDate( )
+{
+    cout<<"month/day/year:"<<month<<"/"<<day<<"/"<<year<<endl;
+}
diff --git a/201816040319/Ex03_15/Date.h b/201816040319/Ex03_15/Date.h
new file mode 100644
index 0000000..85291e0
--- /dev/null
+++ b/201816040319/Ex03_15/Date.h
@@ -0,0 +1,26 @@
+// gitub——3.15
+// Date class definition.
+
+#include <string> // program uses C++ standard string class
+using namespace std;
+
+// Date class definition
+class Date
+{
+public:
+    Date(int year,int month,int day);
+
+    void setDateYear(int Year);
+    int  getDateYear();
+    void setDateMonth(int Month);
+    int  getDateMonth();
+    void setDateDay(int Day);
+    int  getDateDay();
+    void getdisplayDate( );
+
+private:
+    int year;
+    int month;
+    int day;
+
+}; // end class Employee
diff --git a/201816040319/Ex03_15/Ex03_15.cpp b/201816040319/Ex03_15/Ex03_15.cpp
new file mode 100644
index 0000000..3944ba0
--- /dev/null
+++ b/201816040319/Ex03_15/Ex03_15.cpp
@@ -0,0 +1,35 @@
+
+// Create Date objects.
+#include <iostream>
+using namespace std;
+
+#include "Date.h" // include definition of class Date
+
+// function main begins program execution
+int main()
+{
+    int Month;
+    int Day;
+    int Year;
+    cout <<"plese input your number"<<endl;
+    cout <<"Month(1~12)"<<endl;
+    cin  >>Month;
+    cout <<"Day"<<endl;
+    cin  >>Day;
+    cout <<"Year"<<endl;
+    cin  >>Year;
+
+    Date date(Month,Day,Year);
+
+
+    cout <<"检验数据："<<endl;
+    cout<<"Month:"<<date.getDateMonth()<<" "<<"Day:"<<date.getDateDay()<<" "<<"Year:"<<date.getDateYear()<<endl;
+
+
+    cout <<"输出数据:";
+    date.getdisplayDate();
+    return 0;
+
+} // end main
+
+