Just found a round problem

[Ruby Newbee]

irb(main):026:0> 10.499999999999999.round
=> 10
irb(main):027:0> 10.4999999999999999.round
=> 11


Does this happen due to the float problem in any languages including ruby?
Thanks.

 

[Florian Gilcher]

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irb(main):026:0> 10.499999999999999.round
=3D> 10
irb(main):027:0> 10.4999999999999999.round
=3D> 11


Does this happen due to the float problem in any languages including =20=

ruby?
Thanks.

Thats IEEE 754 float behaviour, yes. python behaves exactly the same.

- --
Florian Gilcher

smtp: (e-mail address removed)
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gpg: 533148E2

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[Steve Wilhelm]

Thats IEEE 754 float behaviour, yes. python behaves exactly the same.

- --
Florian Gilcher

And PHP 5 as well.

php -r 'echo sprintf ("PHP Version = %s\nround(10.499999999999999) =
%d\nround(10.4999999999999999) = %d\n", phpversion(),
round(10.499999999999999), round(10.4999999999999999));'

PHP Version = 5.2.6
round(10.499999999999999) = 10
round(10.4999999999999999) = 11

 

[Ruby Newbee]

Thanks all~

And PHP 5 as well.

 

[Thiago Massa]

[Note: parts of this message were removed to make it a legal post.]

In C i think its 14/15 significant digits and its probably why.

If you want that much precision, find a way to use a bigger float.

 

[Marnen Laibow-Koser]

In C i think its 14/15 significant digits and its probably why.

If you want that much precision, find a way to use a bigger float.

BigDecimal and Rational will do the trick.

Best,