s = "Hello"
print("1. 字符 ASCII 码:")
for ch in s:
    print(f"  '{ch}' -> {ord(ch)}")


print("\n2. 验证 chr(65):")
print(f"  chr(65) = '{chr(65)}'")


A = [3, 4]
B = [1, 2]



def add_vectors(v1, v2):
    return [v1[0] + v2[0], v1[1] + v2[1]]



def scalar_multiply(scalar, v):
    return [scalar * v[0], scalar * v[1]]



import math
def vector_length(v):
    return math.sqrt(v[0]**2 + v[1]**2)

print("\n3. 向量计算:")
print(f"  A = {A}")
print(f"  B = {B}")
print(f"  A + B = {add_vectors(A, B)}")
print(f"  2 × A = {scalar_multiply(2, A)}")
print(f"  A 的模 = {vector_length(A)}")