diff --git a/class.cpp b/class/class.cpp
similarity index 97%
rename from class.cpp
rename to class/class.cpp
index 9b0389f..71bd24f 100644
--- a/class.cpp
+++ b/class/class.cpp
@@ -1,3 +1,4 @@
+//未知
 #include<iostream>
 
 using namespace std;
diff --git a/class/shu_zi_jv_xin.cpp b/class/shu_zi_jv_xin.cpp
new file mode 100644
index 0000000..6906ad8
--- /dev/null
+++ b/class/shu_zi_jv_xin.cpp
@@ -0,0 +1,20 @@
+//数字矩形
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main(){
+    int n;
+    cin >>n;
+
+    for (int i = n-1; i < n; i++)
+    {
+        for (int i = 1; i <= n; i++)
+        {
+            cout <<"456"<<endl;
+        }
+                
+    }
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/homework.cpp b/homework.cpp
deleted file mode 100644
index 3d1700f..0000000
--- a/homework.cpp
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <iostream>
-using namespace std;
-
-int main() {
-    // 遍历1到200的所有数
-    for (int i = 1; i <= 200; i++) {
-        // 判断该数是否满足"3721"数的条件
-        if (i % 3 == 2 && i % 7 == 1) {
-            cout << i << " ";  // 输出满足条件的数
-        }
-    }
-    return 0;
-}
diff --git a/homework_2025.1.11.cpp b/homework_2025.1.11.cpp
deleted file mode 100644
index 2649404..0000000
--- a/homework_2025.1.11.cpp
+++ /dev/null
@@ -1,25 +0,0 @@
-#include<iostream>
-using namespace std;
-
-int main(){
-    int n,sum=0;
-    cin >> n;
-    for (int i = 1; i <= n / 2; i++)
-    {
-        if (n % i == 0)
-        {
-            sum += i;
-        }
-    }
-
-    if (sum == n)
-    {
-        cout << "YES" << endl;
-    }
-    else
-    {
-        cout << "NO" << endl;
-    }
-    
-    return 0;
-}
\ No newline at end of file
diff --git a/old_homework/11.15.cpp b/old_homework/11.15.cpp
deleted file mode 100644
index 00fdf5c..0000000
--- a/old_homework/11.15.cpp
+++ /dev/null
@@ -1,42 +0,0 @@
-/*某邮局对邮寄包裹有如下规定:若包裹的重量超过30千克，则不予邮寄，对可以邮寄的包裹每件收取手续费0.2元，再加上根据以下收费标准计算的结果。收费标准(元/千克)
-重量(千克)
-重量<=100.8010<重量<=200.750.7
-20<重量<=30
-请编写一个程序，输入包裹重量，输出所需费用或“Fail”表示无法邮寄*/
-#include<iostream>
-#include<windows.h>
-#include<iomanip>
-
-using namespace std;
-
-int main(){
-    float CIN,money;
-
-    cin >>CIN;
-    
-    if (CIN <= 10)
-    {
-        money = CIN * 0.80 + 0.20;
-        cout <<fixed<<setprecision(2)<<money;
-        Sleep(2000);
-        return 0;
-    }else if (CIN > 10 and CIN <= 20)
-    {
-        money = CIN * 0.75 + 0.20;
-        cout <<fixed<<setprecision(2)<<money;
-        Sleep(2000);
-        return 0;
-    }else if (CIN > 20 and CIN <=30)
-    {
-        money = CIN * 0.7 + 0.20;
-        cout <<fixed<<setprecision(2)<<money;
-        Sleep(2000);
-        return 0;
-    }else
-    {
-        cout <<"Fail!";
-        Sleep(2000);
-        return 1;
-    }
-    return 0;
-}
\ No newline at end of file
diff --git a/old_homework/11.9_1.cpp b/old_homework/11.9_1.cpp
deleted file mode 100644
index 0b628ed..0000000
--- a/old_homework/11.9_1.cpp
+++ /dev/null
@@ -1,40 +0,0 @@
-//登录系统(普通)
-
-#include<iostream>
-#include<string>
-#include<windows.h>
-
-using namespace std;
-
-int main(){
-    string username,password;
-    string uname,pwd;
-
-    username = "2022110";
-    password = "246810";   //设置密码和用户名
-
-    cout <<"欢迎使用登录系统(demo)"<<endl;  //无
-    cout <<"请输入用户名:";  //输入用户名
-    cin >>uname;
-    cout <<"请输入密码:";
-    cin >>pwd;
-
-    if (uname == username)
-    {
-        if (pwd == password)
-        {
-            cout <<"亲爱的小朋友欢迎您!";
-            Sleep(1000);
-            return 0;
-        }else{
-            cout <<"密码错误!";
-            Sleep(1000);
-            return 2;
-        }
-    }else{
-        cout <<"用户名不正确!";
-        Sleep(1000);
-        return 1;
-    }
-    return 0;
-}
\ No newline at end of file
diff --git a/old_homework/11.9_2.cpp b/old_homework/11.9_2.cpp
deleted file mode 100644
index e6c44d9..0000000
--- a/old_homework/11.9_2.cpp
+++ /dev/null
@@ -1,45 +0,0 @@
-//登录系统(升级版)
-
-#include<iostream>
-#include<string>
-#include<windows.h>
-
-using namespace std;
-
-int main(){
-    string username,password;
-    string uname,pwd;
-
-    username = "2022110";
-    password = "246810";   //设置密码和用户名
-
-    cout <<"欢迎使用登录系统(demo)"<<endl;  //无
-    
-   for (int time = 3; time > 0;time = time - 1)   //反复与计数器
-   {
-        int time_out = time -1;
-        cout <<"请输入用户名:";  //输入用户名
-        cin >>uname;
-        cout <<"请输入密码:";  //输入密码
-        cin >>pwd;
-
-        if (uname == username)    //验证用户名是否正确
-        {
-            if (pwd == password)   //验证密码是否正确
-            {
-                cout <<"用户名与密码正确!亲爱的小朋友欢迎您!";   //密码与用户名正确的处理
-                Sleep(1370);
-                return 0;
-            }else{
-                cout <<"密码错误!你还剩下"<<time_out<<"次机会!"<<endl;    //密码错误的处理
-                Sleep(1000);
-            }
-        }else{
-            cout <<"用户名不正确!你还剩下"<<time_out<<"次机会!"<<endl;   //用户名错误的处理
-            Sleep(1000);
-        }
-   }
-    cout <<"尝试次数达到最大!";   //登录次数用完了的处理
-    Sleep(1000);
-    return 1;
-}
\ No newline at end of file
diff --git a/old_homework/12.14.cpp b/old_homework/12.14.cpp
deleted file mode 100644
index 09ae3c3..0000000
--- a/old_homework/12.14.cpp
+++ /dev/null
@@ -1,73 +0,0 @@
-#include<iostream>
-#include<windows.h>
-
-using namespace std;
-void while_on();
-void while_off();
-
-int main(){
-    cout <<"请选择"<<endl;
-    cout <<"1.不带循环版"<<endl<<"2.带循环版"<<endl<<"3.退出"<<endl;
-    cout <<">>>";
-    int count;
-    cin >>count;
-
-    if (count == 1)
-    {
-        while_off();
-    }else if (count == 2)
-    {
-        while_on();
-    }else if (count == 3)
-    {
-        return 0;
-    }else
-    {
-        cout <<"无效的选择!"<<endl;
-        Sleep(1850);
-        return 1;
-    }
-    return 0;    
-}
-
-void while_off(){
-    cout <<"现在模式是 不带循环版"<<endl;
-    Sleep(1250);
-
-    cout <<"请输入一个正整数:";
-    long long num;
-    cin >>num;
-
-    long long count1 = 0;
-    do
-    {
-        num /= 10;
-        count1++;
-    } while (num != 0);
-    
-    cout <<count1<<endl;
-    Sleep(2000);
-}
-
-void while_on(){
-    cout <<"现在模式是 带循环版"<<endl;
-    Sleep(1250);
-
-    while (TRUE)
-    {
-        cout <<"请输入一个正整数:";
-        long long num;
-        cin >>num;
-
-        long long count2 = 0;
-
-        do
-        {
-            num /= 10;
-            count2++;
-        } while (num != 0);
-        
-        cout <<count2<<endl;
-        Sleep(2000);        
-    }
-}
\ No newline at end of file
diff --git a/old_homework/12.21.cpp b/old_homework/12.21.cpp
deleted file mode 100644
index cab478f..0000000
--- a/old_homework/12.21.cpp
+++ /dev/null
@@ -1,59 +0,0 @@
-#include<iostream>
-#include<windows.h>
-
-using namespace std;
-
-void homework1();
-void homework2();
-
-int main(){
-    int choose;
-    cout <<"请选择"<<endl;
-    cout <<"1.输出3的倍数"<<endl;
-    cout <<"2.未知"<<endl;
-    cout <<"3.退出"<<endl;
-    cout <<">>>";
-    cin >>choose;
-
-    if (choose == 1)
-    {
-        homework1();
-    }else if (choose == 2)
-    {
-        homework2;
-    }else if (choose == 3)
-    {
-        return 0;
-    }else
-    {
-        cout <<"未知的选项"<<endl;
-        Sleep(1520);
-        return 1;
-    }
-    return 0;
-}
-
-void homework1(){
-    cout <<"模式 : 1"<<endl;
-    Sleep(1250);
-    int n;
-    cin >> n;
-    for (int i = 3; i < n; i += 3) {
-        cout << i << " ";
-    }
-}
-
-void homework2(){
-    cout <<"模式 : 2"<<endl;
-    Sleep(1250);
-
-    for (char c = 'a'; c <= 'z'; c++) {
-        cout << c;
-    }
-    cout << endl;
-    
-    for (char c = 'Z'; c >= 'A'; c--) {
-        cout << c;
-    }
-
-}
\ No newline at end of file
diff --git a/old_homework/12.28.cpp b/old_homework/12.28.cpp
deleted file mode 100644
index 18fbb13..0000000
--- a/old_homework/12.28.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-#include<iostream>
-
-using namespace std;
-
-int main(){
-    int daxie=65,xiaoxie=97;
-    while (daxie != 91 and xiaoxie != 123)
-    {
-        char daxie_1 = daxie;
-        char xiaaoxie_1 = xiaoxie;
-
-        cout <<daxie_1<<xiaaoxie_1;
-
-        daxie++;
-        xiaoxie++;
-    }
-    
-    
-    return 0;
-}
\ No newline at end of file
diff --git a/old_homework/12.6_1.cpp b/old_homework/12.6_1.cpp
deleted file mode 100644
index 7814187..0000000
--- a/old_homework/12.6_1.cpp
+++ /dev/null
@@ -1,27 +0,0 @@
-//猴子吃桃
-
-#include <iostream>
-using namespace std;
-
-/*
-int main() {
-    int peaches = 1;  // 第10天剩下的桃子数
-    // 逆推从第10天到第1天
-    for (int day = 9; day >= 1; --day) {
-        peaches = (peaches + 1) * 2;  // 每天的桃子数量是前一天的剩余加1再乘2
-    }
-    cout << "第1天摘的桃子数量是: " << peaches << endl;
-    return 0;
-}
-*/
-
-int main(){
-    int x = 1,day = 9;
-    while (day > 0)
-    {
-        x = (x+1) * 2;
-        day--;
-    }
-    cout <<"共摘了"<<x<<"个桃子"<<endl;
-    return 0;
-} 
\ No newline at end of file
diff --git a/old_homework/12.7_2.cpp b/old_homework/12.7_2.cpp
deleted file mode 100644
index f0273af..0000000
--- a/old_homework/12.7_2.cpp
+++ /dev/null
@@ -1,33 +0,0 @@
-//计算阶乘
-#include <iostream>
-using namespace std;
-
-/*
-int main() {
-    int n;
-    cin >> n;  // 输入一个正整数n
-    long long result = 1;  // 使用long long类型来避免结果溢出
-    
-    // 计算阶乘
-    for (int i = 1; i <= n; ++i) {
-        result *= i;
-    }
-
-    cout << result << endl;  // 输出阶乘的结果
-    return 0;
-}
-*/
-
-int main(){
-    long long sum = 1;
-    int n;
-    cin >>n;
-    int i = 1;
-    while (i <= n)
-    {
-        sum *= i;
-        i++;
-    }
-    cout <<sum<<endl;
-    return 0;    
-}
\ No newline at end of file
diff --git a/old_homework/homework_11.22(1).cpp b/old_homework/homework_11.22(1).cpp
deleted file mode 100644
index fb98a37..0000000
--- a/old_homework/homework_11.22(1).cpp
+++ /dev/null
@@ -1,28 +0,0 @@
-#include<iostream>
-#include<windows.h>
-
-using namespace std;
-
-int main(){
-    int tree,wn = 0,clim = 3,time = 0;
-
-    cin >> tree;
-
-    while (wn < tree)
-    {
-        wn += clim;
-        time ++;
-
-        if (wn >= tree)
-        {
-            break;
-        }
-        
-        wn--;
-        time++;
-    }
-
-    cout <<"需要"<<time<<" 分钟才能爬到树顶"<<endl;
-    
-    return 0;
-}
\ No newline at end of file
diff --git a/old_homework/homework_11.22(2).cpp b/old_homework/homework_11.22(2).cpp
deleted file mode 100644
index 81ed3b5..0000000
--- a/old_homework/homework_11.22(2).cpp
+++ /dev/null
@@ -1,21 +0,0 @@
-#include<iostream>
-#include<iomanip>
-
-using namespace std;
-
-int main(){
-    int n;
-
-    cin >> n;
-
-    double sum = 0.0;
-
-    for (int i = 1; i <= n; ++i)
-    {
-        sum += 1.0 / i;
-    }
-
-    cout <<fixed<<setprecision(3)<<sum<<endl;
-
-    return 0;
-}
\ No newline at end of file
diff --git a/old_homework/homework_11.30.cpp b/old_homework/homework_11.30.cpp
deleted file mode 100644
index 43fe2ea..0000000
--- a/old_homework/homework_11.30.cpp
+++ /dev/null
@@ -1,52 +0,0 @@
-#include<iostream>  //字母位移
-
-using namespace std;
-
-/*
-int main(){
-    char CIN,COUT;
-
-    cin >> CIN;
-
-    int CIN2 = CIN+=3;
-    
-    COUT = CIN2;
-
-    cout <<COUT;
-    return 0;
-}
-
-
-int main(){
-    while (true)
-    {
-        char letter;
-        int n = 3;
-
-        cin >>letter;
-        
-        if (letter >= 'A' && letter <= 'Z') {
-            char new_letter = (letter - 'A' + n) % 26 + 'A';
-            cout << new_letter<<endl;
-        }
-    }
-    
-    return 0;
-}*/
-
-int main(){
-    while (true)
-    {
-        char ch1,ch2;
-
-        int n = 3;
-
-        cin >>ch1;
-        ch2 = ((ch1 -65)+n) %26 +65;
-    
-        cout <<ch2<<endl;
-    }
-    
-    
-    return 0;
-}
\ No newline at end of file
diff --git a/old_homework/homework_2.cpp b/old_homework/homework_2.cpp
deleted file mode 100644
index 4b79119..0000000
--- a/old_homework/homework_2.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-#include <iostream>
-#include <iomanip>
-#include <cmath>
-
-using namespace std;
-
-int main() {
-    double r;
-    const double PI = 3.14;
-    cout << "\u8f93\u5165\u534a\u5f84: ";
-    cin >> r;
-
-    if (r < 0 || r > 100) {
-        cout << "\u8f93\u5165\u9519\u8bef: \u534a\u5f84\u5fc5\u987b\u4e3a0\u5230100\u4e4b\u95f4" << endl;
-        return 1;
-    }
-
-    double volume = (4.0 / 3) * PI * pow(r, 3);
-
-    cout << fixed << setprecision(2);
-    cout << "\u4f53\u79ef: " << volume << endl;
-
-    return 0;
-}
diff --git a/old_homework/homework_laster.cpp b/old_homework/homework_laster.cpp
deleted file mode 100644
index ce418f2..0000000
--- a/old_homework/homework_laster.cpp
+++ /dev/null
@@ -1,288 +0,0 @@
-#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; //设置标准命名空间
-void shi_d();
-void bai1();  //定义函数
-void qian();
-void wan();
-void shi_wan();
-void bai_wan();
-void qian_wan();
-void yi();
-void shi_yi();
-
-int main(){
-    //选择
-    cout <<"欢迎使用数字拆分加起来器!"<<endl;
-    cout <<"选择: 1.十位 2.百位 3.千位 4.万位 5.十万位 6.百万位 7.千万位 8.亿位 9.十亿位 10.退出"<<endl;
-    cout <<"请输入完成的操作:";
-    int in;
-    cin >>in;
-    if (in==2)
-    {
-        bai1();
-    }else if (in==1)
-    {
-        shi_d();
-    }else if (in==3)
-    {
-        qian();
-    }else if (in==4)
-    {
-        wan();
-    }else if (in==5)
-    {
-        shi_wan();
-    }else if (in==6)
-    {
-        bai_wan();
-    }else if (in==7)
-    {
-        qian_wan();
-    }else if (in==8)
-    {
-        yi();
-    }else if (in==9)
-    {
-        shi_yi();
-    }else if (in==10)
-    {
-        return 0;
-    }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(){
-    //输出
-    cout <<"现在是十位计算"<<endl;
-    Sleep(550);
-    cout <<"请输入一个十位数字(10):";
-
-    int number;  //输入
-    cin >>number;
-
-    //计算模块 
-    int ge,shi1;
-    ge = number % 10;
-    shi1 = number / 10 % 10;
-    number = ge + shi1;
-
-    cout <<"结果为"<<number<<endl;  //输出结果
-    Sleep(1500);
-
-    exit(0);
-}
-
-void bai1(){
-    //输入
-    cout <<"现在是百位计算"<<endl;
-    Sleep(550);
-    cout <<"请输入一个百位数字(100):";
-    int number;
-    cin >>number;
-
-    //计算模块
-    int ge,shi1,bai;
-    ge = number % 10;
-    shi1 = number / 10 % 10;
-    bai = number / 100;
-    number = ge + shi1 + bai;
-
-    cout <<"结果为:"<<number;  //输出结果
-    Sleep(1500);
-
-    exit(0);
-}
-
-void qian(){
-    cout <<"现在是千位计算"<<endl;  //输出
-    Sleep(550);
-    cout <<"请输入一个千位数字(1000):";
-
-    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;  //输出结果
-    Sleep(1500);
-
-    exit(0);
-}
-
-void wan(){
-    //输出
-    cout <<"现在是万位计算"<<endl;
-    Sleep(550);
-    cout <<"请输入一个万位数字(10000):";
-
-    //输入
-    int number;
-    cin >>number;
-
-    //计算模块
-    int ge,shi,bai,qian,wan1;
-    ge = number % 10;
-    shi = number / 10 % 10;
-    bai = number / 100 % 10;
-    qian = number / 1000 % 10;
-    wan1 = number / 10000;
-    number = ge + shi + bai + qian + wan1;
-    
-    cout <<"结果为:"<<number;  //输出结果
-    Sleep(1500);
-
-    exit(0);
-}
-
-void shi_wan(){
-    cout <<"现在是十万位计算"<<endl;  //说明
-    Sleep(550);
-    cout <<"请输入一个十万位的数字(100000):";
-
-    int number;  //输入
-    cin >>number;
-
-    //计算模块
-    int ge,shi,bai,qian,wan,shi_wan1;
-    ge = number % 10;
-    shi = number / 10 % 10;
-    bai = number /100 % 10;
-    qian = number / 1000 % 10;
-    wan = number / 10000 % 10;
-    shi_wan1 = number / 100000;
-    number = ge + shi + bai + qian + wan + shi_wan1;
-    
-    //输出结果
-    cout <<"结果为:"<<number;
-    Sleep(1500);
-
-    exit(0);
-}
-
-void bai_wan(){
-    //说明
-    cout <<"现在是百万位计算"<<endl;
-    Sleep(550);
-    cout <<"请输入一个百万位的数字(1000000):";
-
-    int number; //输入
-    cin >>number;
-
-    //计算模块
-    int ge,shi,bai,qian,wan,shi_wan,bai_wan1;
-    ge = number % 10;
-    shi = number / 10 % 10;
-    bai = number / 100 % 10;
-    qian = number / 1000 % 10;
-    wan = number / 10000 % 10;
-    shi_wan = number / 100000 % 10;
-    bai_wan1 = number / 1000000;
-    number = ge + shi + bai + qian + wan + shi_wan + bai_wan1;
-
-    //输出结果
-    cout <<"结果为:"<<number;
-    Sleep(1500);
-
-    exit(0);
-}
-
-void qian_wan(){
-    //说明
-    cout <<"现在是千万位计算"<<endl;
-    Sleep(550);
-    cout <<"请输入一个千万位数字(10000000):";
-
-    //输入
-    int number;
-    cin >>number;
-
-    //计算模块
-    int ge,shi,bai,qian,wan,shi_wan,bai_wan,qian_wan1;
-    ge = number % 10;
-    shi = number / 10 % 10;
-    bai = number / 100 % 10;
-    qian = number /1000 % 10;
-    wan = number / 10000 % 10;
-    shi_wan = number / 100000 % 10;
-    bai_wan = number / 1000000 % 10;
-    qian_wan1 = number / 10000000;
-    number = ge + shi + bai + qian + wan + shi_wan + bai_wan + qian_wan1;
-    
-    //输出结果
-    cout <<"结果为:"<<number;
-    Sleep(1500);
-
-    exit(0);
-}
-
-void yi(){
-    //说明
-    cout <<"现在是亿位计算"<<endl;
-    Sleep(550);
-    cout <<"请输入一个亿位数字(100000000):";
-
-    //输入
-    int number;
-    cin >>number;
-
-    //计算模块
-    int ge,shi,bai,qian,wan,shi_wan,bai_wan,qian_wan,yi1;
-    ge = number % 10;
-    shi = number / 10 % 10;
-    bai = number / 100 % 10;
-    qian = number /1000 % 10;
-    wan = number / 10000 % 10;
-    shi_wan = number / 100000 % 10;
-    bai_wan = number / 1000000 % 10;
-    qian_wan = number / 10000000 % 10;
-    yi1 = number / 100000000;
-    number = ge + shi + bai + qian + wan + shi_wan + bai_wan + qian_wan + yi1;
-
-    //输出结果
-    cout <<"结果为:"<<number;
-    Sleep(1500);
-
-    exit(0);
-}
-
-void shi_yi(){
-    //说明
-    cout <<"现在是十亿位计算"<<endl;
-    Sleep(550);
-    cout <<"请输入一个亿位数字(1000000000):";
-
-    //输入
-    int number;
-    cin >>number;
-
-    //计算模块
-    int ge,shi,bai,qian,wan,shi_wan,bai_wan,qian_wan,yi,shi_yi1;
-    ge = number % 10;
-    shi = number / 10 % 10;
-    bai = number / 100 % 10;
-    qian = number /1000 % 10;
-    wan = number / 10000 % 10;
-    shi_wan = number / 100000 % 10;
-    bai_wan = number / 1000000 % 10;
-    qian_wan = number / 10000000 % 10;
-    yi = number / 100000000 % 10;
-    shi_yi1 = number / 1000000000;
-    number = ge + shi + bai + qian + wan + shi_wan + bai_wan + qian_wan + yi;
-
-    //输出结果
-    cout <<"结果为:"<<number;
-    Sleep(1500);
-
-    exit(0);
-}
\ No newline at end of file
diff --git a/old_homework/maths.cpp b/old_homework/maths.cpp
deleted file mode 100644
index 5364203..0000000
--- a/old_homework/maths.cpp
+++ /dev/null
@@ -1,74 +0,0 @@
-#include <iostream>
-using namespace std;
-
-// 函数声明
-void qian1();  // 千位计算
-void shi11();  // 十位计算
-void bai1();   // 百位计算
-
-int main() {
-    int in;
-    cout << "1.千位 2.十位 3.百位" << endl;
-    cin >> in;
-
-    // 使用 '==' 进行条件判断
-    if (in == 1) {
-        qian1();
-    } else if (in == 2) {
-        shi11();
-    } else if (in == 3) {
-        bai1();
-    } else {
-        cout << "无效输入,请输入1、2或3。" << endl; // 处理无效输入
-    }
-
-    return 0; // 返回0表示程序正常结束
-}
-
-void qian1() {
-    cout << "现在是千数计算" << endl;
-    int number1, ge1, shi1, bai1, qian1;
-    cout << "请输入一个四位数: ";
-    cin >> number1;
-
-    // 计算各位数字
-    ge1 = number1 % 10;
-    shi1 = (number1 / 10) % 10;
-    bai1 = (number1 / 100) % 10;
-    qian1 = number1 / 1000;
-
-    // 重新组合数字
-    number1 = ge1 * 1000 + shi1 * 100 + bai1 * 10 + qian1;
-    cout << "重新组合后的数字是: " << number1 << endl;
-}
-
-void shi11() {
-    cout << "现在是十数计算" << endl;
-    int number, ge, shi;
-    cout << "请输入一个两位数: ";
-    cin >> number;
-
-    // 计算各位数字
-    ge = number % 10;
-    shi = number / 10;
-
-    // 重新组合数字
-    number = ge * 10 + shi;
-    cout << "重新组合后的数字是: " << number << endl;
-}
-
-void bai1() {
-    cout << "现在是百数计算" << endl;
-    int number, ge, shi, bai;
-    cout << "请输入一个三位数: ";
-    cin >> number;
-
-    // 计算各位数字
-    ge = number % 10;
-    shi = (number / 10) % 10;
-    bai = number / 100;
-
-    // 重新组合数字
-    number = ge * 100 + shi * 10 + bai;
-    cout << "重新组合后的数字是: " << number << endl;
-}