实现任意长的整数进行加法运算的演示程序

以下是一个实现任意长整数加法的演示程序：

def add(num1, num2):
    # 将两个数字转换为字符串并反转
    num1, num2 = str(num1)[::-1], str(num2)[::-1]
    # 确定两个数字中较长的那个
    if len(num1) < len(num2):
        num1, num2 = num2, num1
    # 补齐较短的数字
    num2 += '0' * (len(num1) - len(num2))
    # 进位标志
    carry = 0
    # 存储结果的列表
    result = []
    # 逐位相加
    for i in range(len(num1)):
        # 将字符转换为数字
        n1, n2 = int(num1[i]), int(num2[i])
        # 计算当前位的和
        s = n1 + n2 + carry
        # 判断是否需要进位
        if s >= 10:
            carry = 1
            s -= 10
        else:
            carry = 0
        # 将当前位的和添加到结果列表中
        result.append(str(s))
    # 如果最高位有进位，需要将进位加到结果中
    if carry:
        result.append(str(carry))
    # 反转结果并转换为数字
    return int(''.join(result[::-1]))

该程序可以处理任意长度的整数加法，例如：

>>> add(123456789, 987654321)
1111111110
>>> add(999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999