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


print(f"ASCII码65对应的字符为: {chr(65)}")
##图像是规则数值矩阵易处理，文本是离散符号序列，需理解语义更难
# 题目3
A = [3, 4]
B = [1, 2]
def vector_add(a, b):
    return [x + y for x, y in zip(a, b)]

def scalar_multiply(scalar, vector):
    return [scalar * x for x in vector]

def vector_norm(vector):
    return sum(x**2 for x in vector) ** 0.5

print("题目3:")
print("A + B =", vector_add(A, B))
print("2 × A =", scalar_multiply(2, A))
print("|A| =", vector_norm(A))
A4 = [1, 2, 3]
B4 = [4, 5, 6]
def dot_product(a, b):
    return sum(x * y for x, y in zip(a, b))
def cosine_similarity(a, b):
    norm_a = vector_norm(a)
    norm_b = vector_norm(b)
    if norm_a == 0 or norm_b == 0:
        return 0.0
    return dot_product(a, b) / (norm_a * norm_b)

print("\n题目4:")
print("A · B =", dot_product(A4, B4))
print("余弦相似度 =", cosine_similarity(A4, B4))
A5 = [1, 0]
B5 = [0, 1]
print("\n题目4 第3问:")
print("A = [1, 0], B = [0, 1] 的余弦相似度 =", cosine_similarity(A5, B5))