Question

我实现了一个UnboundInteger类，它表现为常规整数。我们的想法是能够在任意大的范围内进行操作对两边都没有任何限制的整数支持的大小。

这是我的代码

class UnboundInteger(object):

def __init__(self, integer):
    self.integer = str(integer)


def __add__(self, other):
    carry = '0'
    temp = '0'
    result = ''

    if (len(self.integer) > len(other.integer)):
        num_of_zeros = len(self.integer) - len(other.integer)
        other.integer = '0' * num_of_zeros + other.integer

    elif (len(self.integer < other.integer)):
        num_of_zeros = len(other.integer) - len(self.integer)
        self.integer = '0' * num_of_zeros + self.integer

    for i in range(1, len(self.integer)+1):
        temp = str(int(self.integer[-i]) + int(other.integer[-i]) + int(carry))
        temp = '0' + temp
        temp = temp[-1]
        carry = temp[-2]
        result = temp + result

    return UnboundInteger(result)



@classmethod
def from_int(cls, integer):
    '''\
    Take in a integer and build the unbound integer object.
    '''
    ub_integer = cls(integer)
    return ub_integer

不幸的是我无法调试错误请帮帮我

这是错误

    In [40]: reload(test)
Out[40]: <module 'test' from 'test.py'>

In [41]: a = test.UnboundInteger(1000000000000)

In [42]: b = test.UnboundInteger(20000000000)

In [43]: a + b
---------------------------------------------------------------------------
IndexError                                Traceback (most recent call last)
<ipython-input-43-f96fb8f649b6> in <module>()
----> 1 a + b

/home/neel101/test.py in __add__(self, other)
     17             temp = '0' + temp
     18             temp = temp[-1]
---> 19             carry = temp[-2]
     20             result = temp + result
     21 

IndexError: string index out of range

或者解决此问题的更好方法。请让我知道！

Answer 1

这是因为你正在覆盖临时变量。

temp = '0' + temp
temp = temp[-1]
carry = temp[-2]

应该是这样的：

temp = '0' + temp
carry = temp[-2]
temp = temp[-1]

未绑定的整数类

1 个答案: