diff --git a/homework_2.cpp b/homework_2.cpp
index 912beca..e6b71b6 100644
--- a/homework_2.cpp
+++ b/homework_2.cpp
@@ -5,18 +5,24 @@
 using namespace std; //设置标准命名空间
 void shi_d();
 void bai1();  //定义函数
+void qian();
 
 int main(){
     //选择
-    cout <<"请输入完成的操作(1.百位计算2.十位计算)";
+    cout <<"欢迎使用数字组合器!"<<endl;
+    cout <<"选择: 1.十位 2.百位 3.千位 4.退出"<<endl;
+    cout <<"请输入完成的操作:";
     int in;
     cin >>in;
-    if (in==1)
+    if (in==2)
     {
         bai1();
-    }else if (in==2)
+    }else if (in==1)
     {
         shi_d();
+    }else if (in==3)
+    {
+        qian();
     }else{
         cout <<"输入错误！请重新运行程序并输入正确的编号!";
         Sleep(1250);
@@ -47,11 +53,29 @@ void bai1(){
     cin >>number;
 
     //计算模块
-    int ge,shi1,bai1;
+    int ge,shi1,bai;
     ge = number % 10;
     shi1 = number / 10 % 10;
-    bai1 = number / 100;
-    number = ge + shi1 + bai1;
+    bai = number / 100;
+    number = ge + shi1 + bai;
+    cout <<"结果为:"<<number;
+    Sleep(1500);
+    exit(0);
+}
+
+void qian(){
+    cout <<"现在是千位计算"<<endl;  //输出
+    cout <<"请输入一个千位数字:";
+
+    int number;  //输入
+    cin >>number;
+
+    int ge,shi,bai,qian;     //计算模块
+    ge = number % 10;
+    shi = number / 10 % 10;
+    bai = number / 100 % 10;
+    qian = number / 1000;
+    number = ge + shi + bai + qian;
     cout <<"结果为:"<<number;
     Sleep(1500);
     exit(0);
diff --git a/homework_2.exe b/homework_2.exe
new file mode 100644
index 0000000..4e0ed2a
Binary files /dev/null and b/homework_2.exe differ