[FIXED] How to fix python float numbers exponential result

Issue

I was playing with datatypes in python.

Every time, when I do

remaining_amount = .1 + .1 + .1 - .3

python gives an exponential result.

I try to do the same with c#

double remainingAmount = .1 + .1 + .1 - .3

It is also giving result in exponential form.

In both cases, the result is 5.55111512312578E-17

But in c#, when I change double to decimal, the result is 0.0

I am unable to understand why this is happening in both languages. And how can I fix this in python?

Solution

@Netwave is correct, as you wanted to fix this in python, the way would be decimal module:

>>> from decimal import Decimal
>>> Decimal('.1') + Decimal('.1') + Decimal('.1') - Decimal('.3')
Decimal('0.0')
>>> float(Decimal('.1') + Decimal('.1') + Decimal('.1') - Decimal('.3'))
0.0
>>> 

Answered By - U12-Forward

Answer Checked By - Marie Seifert (PHPFixing Admin)