s = "Hello"
for char in s:
    print(f"'{char}' 的ASCII码: {ord(char)}")
    print(f"ASCII码65对应的字符: {chr(65)}")
import math

# 题目3
A = [3, 4]
B = [1, 2]
# 1. A+B
A_plus_B = [A[0]+B[0], A[1]+B[1]]
# 2. 2*A
two_A = [2*A[0], 2*A[1]]
# 3. A的模
norm_A = math.sqrt(A[0]**2 + A[1]**2)
print("题目3结果：")
print(f"A+B = {A_plus_B}")
print(f"2*A = {two_A}")
print(f"A的模 = {norm_A}")

# 题目4
A = [1, 2, 3]
B = [4, 5, 6]
# 1. 点积
dot_product = sum(a*b for a,b in zip(A,B))
# 2. 余弦相似度
norm_A = math.sqrt(sum(a**2 for a in A))
norm_B = math.sqrt(sum(b**2 for b in B))
cos_sim = dot_product / (norm_A * norm_B)
print("\n题目4-1、2结果：")
print(f"点积 = {dot_product}")
print(f"余弦相似度 = {cos_sim:.4f}")

# 题目4-3
A2 = [1, 0]
B2 = [0, 1]
dot_product2 = sum(a*b for a,b in zip(A2,B2))
norm_A2 = math.sqrt(sum(a**2 for a in A2))
norm_B2 = math.sqrt(sum(b**2 for b in B2))
cos_sim2 = dot_product2 / (norm_A2 * norm_B2)
print("\n题目4-3结果：")
print(f"余弦相似度 = {cos_sim2}")