diff --git a/change.exe b/change.exe
deleted file mode 100644
index 0609705..0000000
Binary files a/change.exe and /dev/null differ
diff --git a/homework.exe b/homework.exe
deleted file mode 100644
index 27560ac..0000000
Binary files a/homework.exe and /dev/null differ
diff --git a/homework_2.cpp b/homework_2.cpp
new file mode 100644
index 0000000..7160f95
--- /dev/null
+++ b/homework_2.cpp
@@ -0,0 +1,55 @@
+#include<iostream>
+#include<windows.h>
+#include<cstdlib>
+
+using namespace std;
+void shi_d;
+void bai1;
+
+int main(){
+    cout <<"请输入完成的操作(1.百位计算2.十位计算)";
+    int in;
+    cin >>in;
+
+    if (in==Unknown)
+    {
+        cout <<"你没有输入数字!";
+        Sleep(1250);
+        return 1;
+    }else if (in==1)
+    {
+        bai1();
+    }else if (in==2)
+    {
+        shi_d;
+    }else{
+        cout <<"输入错误！请重新运行程序并输入正确的编号!";
+        Sleep(1250);
+        return 1;
+    }    
+}
+
+void shi_d(){
+    int number,shi1,ge;
+    cout <<"请输入一个十位数字：";
+    cin >>number;
+
+    if (number==Unknown)
+    {
+        cout <<"你没有输入数字！";
+        Sleep(1250);
+        exit(0);
+    }
+
+    //计算模块 
+    ge = number % 10;
+    shi1 = number / 10 % 10;
+    number = ge + shi1;
+    cout <<"结果为"<<number<<endl;  //输出
+    Sleep(1500);
+    exit(0);
+}
+
+void bai1(){
+    exit(0);
+}
\ No newline at end of file