From e0989d166402ae91f95affd570c4117865ef324a Mon Sep 17 00:00:00 2001
From: IaintHamburger <112560102+IaintHamburger@users.noreply.github.com>
Date: Sun, 23 Apr 2023 22:31:29 +0800
Subject: [PATCH 1/2] Create LoginSystem.cpp

---
 LoginSystem.cpp | 81 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 LoginSystem.cpp

diff --git a/LoginSystem.cpp b/LoginSystem.cpp
new file mode 100644
index 0000000..544a61e
--- /dev/null
+++ b/LoginSystem.cpp
@@ -0,0 +1,81 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+void registor();
+void login();
+void change();
+
+vector<string> accounts;
+vector<string> passwords;
+vector<string> changepassword;
+
+int main() {
+    while (true) {
+        cout << "註冊(1) 或 登入(2) 或 改密碼(3)\n";
+        char option;
+        cin >> option;
+    
+        if (option == '1') {
+            registor();
+        } else if (option == '2') {
+            login();
+        } else {
+            change();
+        }       
+    }
+}
+
+void registor() {
+    cout << "請輸入帳號：\n";
+    string input_account;
+    cin >> input_account;
+    accounts.push_back(input_account);
+
+    cout << "請輸入密碼：\n";
+    string input_password;
+    cin >> input_password;
+    passwords.push_back(input_password);
+}
+
+void login() {
+    cout << "請輸入帳號：\n";
+    string login_account;
+    cin >> login_account;
+
+    cout << "請輸入密碼：\n";
+    string login_password;
+    cin >> login_password;
+
+    bool found = false;
+    for (int i = 0; i < accounts.size(); i++) {
+        if (login_account == accounts[i] && login_password == passwords[i]) {
+            cout << "歡迎第" << i + 1 << "個使用者\n";
+            found = true;
+            break;
+        }
+    }
+    if (found == false) {
+        cout << "無效的帳號或密碼\n";
+    }
+}
+void change() {
+    cout << "請輸入帳號：\n";
+    string login_account;
+    cin >> login_account;
+
+    cout << "請輸入密碼：\n";
+    string login_password;
+    cin >> login_password;
+
+    bool found = false;
+    for (int i = 0; i < accounts.size(); i++) {
+         if (login_account == accounts[i] && login_password == passwords[i]) {
+             cout << "請輸入你想改的密碼：\n";
+             string newpassword;
+             cin >> newpassword;
+             passwords[i] = newpassword;
+         }
+    }
+}
+    

From 6f9120f628d1c69bf24c41ecd0c7cb6ebd1969aa Mon Sep 17 00:00:00 2001
From: IaintHamburger <112560102+IaintHamburger@users.noreply.github.com>
Date: Thu, 27 Apr 2023 19:09:28 +0800
Subject: [PATCH 2/2] Update LoginSystem.cpp

---
 LoginSystem.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/LoginSystem.cpp b/LoginSystem.cpp
index 544a61e..4d1b9d8 100644
--- a/LoginSystem.cpp
+++ b/LoginSystem.cpp
@@ -20,9 +20,11 @@ int main() {
             registor();
         } else if (option == '2') {
             login();
-        } else {
+        } else if (option == '3') {
             change();
-        }       
+        } else {
+            cout << "無效的指令，請重新輸入：\n";
+        }
     }
 }