s="Hello"
for char in s:
    print(f"{char}的ASCII码是{ord(char)}")

A=[3,4]
B=[1,2]
add_result=[A[i]+B[i]for i in range(len(A))]
print("题目3-1 A+B结果:",add_result)
mult_result=[2* x for x in A]
print("题目3-2 2*A结果：",mult_result)
import math
a_length=math.sqrt(sum(x**2 for x in A))
print("题目3-3 A的长度：",a_length)

A1=[1,2,3]
B1=[4,5,6]
dot_product=sum(A1[i]*B1[i]for i in range(len(A1)))
print("\n题目4-1 点积结果：",dot_product)
a_len=math.sqrt(sum(x**2 for x in A1))
b_len=math.sqrt(sum(x**2 for x in B1))
cos_sim=dot_product/(a_len*b_len)
print("题目4-2 余弦相似度:",cos_sim)
A2=[1,0]
B2=[0,1]
dot2=sum(A2[i]*B2[i]for i in range(len(A2)))
a2_len=math.sqrt(sum(x**2 for x in A2))
b2_len=math.sqrt(sum(x**2 for x in B2))
cos_sim2=dot2/(a2_len*b2_len)
print("题目4-3 余弦相似度：",cos_sim2,",原因：两个向量正交（夹角90度)")