将十进制数转换为二进制数的PYTHON程序

def decimal_to_binary(decimal_num):
    return bin(decimal_num)[2:]  # [2:] 去掉前缀 '0b'

# 示例
decimal_number = 42
binary_number = decimal_to_binary(decimal_number)
print(f"The binary representation of {decimal_number} is {binary_number}")

def decimal_to_binary_manual(decimal_num):
    if decimal_num == 0:
        return "0"
    binary_str = ""
    while decimal_num > 0:
        remainder = decimal_num % 2
        binary_str = str(remainder) + binary_str
        decimal_num = decimal_num // 2
    return binary_str

# 示例
decimal_number = 42
binary_number = decimal_to_binary_manual(decimal_number)
print(f"The binary representation of {decimal_number} is {binary_number}")

def decimal_to_binary_recursive(decimal_num):
    if decimal_num == 0:
        return ""
    else:
        return decimal_to_binary_recursive(decimal_num // 2) + str(decimal_num % 2)

# 示例
decimal_number = 42
binary_number = decimal_to_binary_recursive(decimal_number)
print(f"The binary representation of {decimal_number} is {binary_number}")