From bdda7b32301e9197d1d896f022fd5d238cb2ee0f Mon Sep 17 00:00:00 2001
From: 2509165015 <2509165015@student.edu.cn>
Date: Tue, 21 Apr 2026 11:20:54 +0800
Subject: [PATCH] =?UTF-8?q?3-2-1=20=E6=96=87=E6=9C=AC=E6=95=B0=E6=8D=AE?=
 =?UTF-8?q?=E5=A4=84=E7=90=86=E5=AF=BC=E8=AE=BA?=
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---
 0421+2509165015/1.py |  6 ++++++
 0421+2509165015/2.py | 28 ++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 0421+2509165015/1.py
 create mode 100644 0421+2509165015/2.py

diff --git a/0421+2509165015/1.py b/0421+2509165015/1.py
new file mode 100644
index 0000000..111de1c
--- /dev/null
+++ b/0421+2509165015/1.py
@@ -0,0 +1,6 @@
+print("=== 1. 打印Hello每个字符的ASCII码 ===")
+for char in "Hello":
+    print(f"字符 '{char}' 的ASCII码: {ord(char)}")
+print("\n=== 2. 验证 chr(65) ===")
+result = chr(65)
+print(f"chr(65) 的结果是: {result}")
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diff --git a/0421+2509165015/2.py b/0421+2509165015/2.py
new file mode 100644
index 0000000..e338c17
--- /dev/null
+++ b/0421+2509165015/2.py
@@ -0,0 +1,28 @@
+import math
+print("===== 题目3 向量运算 =====")
+A = [3, 4]
+B = [1, 2]
+A_plus_B = [a + b for a, b in zip(A, B)]
+print(f"A + B = {A_plus_B}")
+two_A = [2 * a for a in A]
+print(f"2 * A = {two_A}")
+norm_A = math.sqrt(sum(x**2 for x in A))
+print(f"A的模长 = {norm_A}")
+print("\n===== 题目4 点积 & 余弦相似度 =====")
+A1 = [1, 2, 3]
+B1 = [4, 5, 6]
+dot1 = sum(a*b for a, b in zip(A1, B1))
+norm_A1 = math.sqrt(sum(x**2 for x in A1))
+norm_B1 = math.sqrt(sum(x**2 for x in B1))
+cos1 = dot1 / (norm_A1 * norm_B1)
+print(f"A1·B1 点积 = {dot1}")
+print(f"A1、B1 余弦相似度 = {cos1:.4f}")
+A2 = [1, 0]
+B2 = [0, 1]
+dot2 = sum(a*b for a, b in zip(A2, B2))
+norm_A2 = math.sqrt(sum(x**2 for x in A2))
+norm_B2 = math.sqrt(sum(x**2 for x in B2))
+cos2 = dot2 / (norm_A2 * norm_B2)
+print(f"\nA2·B2 点积 = {dot2}")
+print(f"A2、B2 余弦相似度 = {cos2}")
+print("原因：两向量正交（夹角90°），余弦值为0")
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