diff --git a/4-21 48.py b/4-21 48.py
new file mode 100644
index 0000000..5d993fd
--- /dev/null
+++ b/4-21 48.py	
@@ -0,0 +1,9 @@
+#题目一
+word="Hello"
+print("方式一：字符的ASCII码")
+for ch in word:
+    print(f"'{ch}'->{ord(ch)}")
+print("\n方式二：验证chr(65)")
+print(f"chr(65)='{chr(65)}'")
+print(f"验证成果：{chr(65)=='A'}")
+#题目三