diff --git a/homework.cpp b/homework.cpp
deleted file mode 100644
index 511d693..0000000
--- a/homework.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-#include<iostream>  //主要输入输出模块
-#include<windows.h>  //等待模块
-using namespace std;  //标准命名空间
-
-int main(){
-    //输入模块
-    cout <<"请输入一个十位数数字:";
-    int number;
-    cin >>number; //输入
- 
-    //计算模块 
-    int ge,shi1;
-    ge = number % 10;
-    shi1 = number / 10 % 10;
-    number = ge + shi1;
-    cout <<"结果为"<<number<<endl;  //输出
-    Sleep(1500);
-    return 0;
-}
\ No newline at end of file
diff --git a/homework_2.cpp b/homework_2.cpp
index 7160f95..912beca 100644
--- a/homework_2.cpp
+++ b/homework_2.cpp
@@ -1,27 +1,22 @@
-#include<iostream>
-#include<windows.h>
-#include<cstdlib>
+#include<iostream>  //必要头文件
+#include<windows.h>  //等待头文件
+#include<cstdlib>  //退出头文件
 
-using namespace std;
-void shi_d;
-void bai1;
+using namespace std; //设置标准命名空间
+void shi_d();
+void bai1();  //定义函数
 
 int main(){
+    //选择
     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)
+    if (in==1)
     {
         bai1();
     }else if (in==2)
     {
-        shi_d;
+        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);
@@ -30,17 +25,11 @@ int main(){
 }
 
 void shi_d(){
+    //输入
     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;
@@ -51,5 +40,19 @@ void shi_d(){
 }
 
 void bai1(){
+    //输入
+    cout <<"现在是百位计算"<<endl;
+    cout <<"请输入一个百位数字:";
+    int number;
+    cin >>number;
+
+    //计算模块
+    int ge,shi1,bai1;
+    ge = number % 10;
+    shi1 = number / 10 % 10;
+    bai1 = number / 100;
+    number = ge + shi1 + bai1;
+    cout <<"结果为:"<<number;
+    Sleep(1500);
     exit(0);
 }
\ No newline at end of file