diff --git a/diy3.py b/diy3.py
new file mode 100644
index 0000000..a0b98ed
--- /dev/null
+++ b/diy3.py
@@ -0,0 +1,10 @@
+username="python"
+userpassword="123456"
+while True:
+    name=input("用户名：")
+    password=input("密码：")
+    if username!=name:
+        print("用户名错误！请重新输入！")
+    if userpassword!=password:
+        print("密码错误！请重新输入！")
+print("欢迎来到贝尔编程")
diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..43c6e1b
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,14 @@
+username="python"
+userpassword="123456"
+while True:
+    name=input("用户名：")
+    password=input("密码：")
+    if username==name and userpassword==password:
+        print("登录成功")
+        break
+    if username!=name:
+        print("用户名错误！请重新输入！")
+        continue
+    if userpassword!=password:
+        print("密码错误！请重新输入！")
+print("欢迎来到贝尔编程")
\ No newline at end of file