Floating point numbers in python

Question

How to get correct number after calculation? For instance, I want 2.2 - 1 equal to 1.2 and not 1.2000000000002. Wanna get exactly correct answer without rounding the number itself and without just simply changing the way of printing the number via print('%1.1f' % number).

2

What's wrong with rounding? – Loocid Aug 08 '18 at 08:33

score 1 · Answer 1 · answered Aug 08 '18 at 08:33

1

Since you don't want string formatting, You can do round:

>>> a=2.2
>>> b=1
>>> round(a-b,1)
1.2
>>>

answered Aug 08 '18 at 08:33

U13-Forward

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I told I don't want number rounding. I need exactly correct answer to operate with. – bL1deR Aug 08 '18 at 09:35

score 0 · Answer 2 · answered Aug 08 '18 at 08:37

0

Use format,

In [7]: '{:.2f}'.format(2.2 - 1)
Out[7]: '1.20'

answered Aug 08 '18 at 08:37

Rahul K P

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Floating point numbers in python

2 Answers2