Question

How to use decimal in Python

Answer 1

from decimal import Decimal

decimal = Decimal(3.14159)
print(decimal)

result = decimal * 17
print(result)  





'''
run:

3.14158999999999988261834005243144929409027099609375
53.40702999999999800451178089

'''

 

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Answer 2

from decimal import Decimal

x = Decimal('0.2')
y = Decimal('0.2')
z = Decimal('0.2')

result = x + y + z

print(result)





'''
run:

0.6

'''

 

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Answer 3

from decimal import Decimal

x = Decimal('2.19')
y = Decimal('3.99')
print(round(x, 1))
print(round(y, 1))

a = Decimal('2.15')
b = Decimal('3.55')
print(round(a, 1))
print(round(b, 1))






'''
run:

2.2
4.0
2.2
3.6

'''

 

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Answer 4

from decimal import Decimal
import decimal

context = decimal.getcontext()
context.rounding = decimal.ROUND_HALF_DOWN


x = Decimal('2.19')
y = Decimal('3.99')
print(round(x, 1))
print(round(y, 1))

a = Decimal('2.15')
b = Decimal('3.55')
print(round(a, 1))
print(round(b, 1))






'''
run:

2.2
4.0
2.1
3.5

'''

 

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Answer 5

from decimal import Decimal

pi = Decimal((0, (3, 1, 4), -2) # 314 x 10^-2

print(pi)






'''
run:

3.14

'''
 

 

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Answer 6

from decimal import Decimal

d = Decimal(0.1)

print(d)






'''
run:

0.1000000000000000055511151231257827021181583404541015625

'''

 

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