在Python中的浮点减法 [英] floating point subtraction in python
问题描述
我有价值
$ p $ a $ 1460356156116843.000000 b = 2301.93138123
当我尝试打印 ab
时,结果是 1460356156114541.000000
与实际值相反值 1460356156114541.06861877
。
在执行浮点运算时,python有什么限制。有没有什么办法在Python中,通过我可以得到这种减法的实际结果?
作为所有其他语言的点算术。您可以使用 Decimal
以获得准确的结果:
pre $ 从十进制进位十进制
a =十进制(' 1460356156116843.000000')
b =十进制('2301.93138123')
打印a - b#1460356156114541.06861877
I'm trying to subtract to floating point numbers in python. I've values
a = 1460356156116843.000000, b = 2301.93138123
When I try to print a-b
, it's resulting the value 1460356156114541.000000
contrary to the actual value 1460356156114541.06861877
.
What are the limitations in python while doing floating point arithmetic. Is there any way in python through which I can get the actual result of this subtraction?
Python has the same limitations for floating point arithmetic as all the other languages. You can use Decimal
to get the accurate result:
from decimal import Decimal
a = Decimal('1460356156116843.000000')
b = Decimal('2301.93138123')
print a - b # 1460356156114541.06861877
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