BigDecimal в ruby

ruby-talk
1

Hi All.

That there is such a case:

require 'bigdecimal/math'
include BigMath

num1 = BigDecimal.new(1) / BigDecimal.new(6);
num2= BigDecimal.new(1) / BigDecimal.new(600);
num3 = BigDecimal.new(1) / BigDecimal.new(600000);
num4 = BigDecimal.new(1) / BigDecimal.new(60000011);

printf(num1.to_s + "\n");
printf(num2.to_s + "\n");
printf(num3.to_s + "\n");
printf(num4.to_s + "\n");

obtain the following results:

0.166666666666666667E0
0.1666666666666667E-2
0.1666666666667E-5
0.16666663611E-7

Question: How I can fixate digits after point (in any manipulation
return 32(for example) digits after point? And the second question is
why it rounds them differently? (first gave to 18 characters, the second
16, third 13, fourth 11)

Thank you in advance.

···

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Posted via http://www.ruby-forum.com/.

2

Hi All.

That there is such a case:

require 'bigdecimal/math'
include BigMath

num1 = BigDecimal.new(1) / BigDecimal.new(6);
num2= BigDecimal.new(1) / BigDecimal.new(600);
num3 = BigDecimal.new(1) / BigDecimal.new(600000);
num4 = BigDecimal.new(1) / BigDecimal.new(60000011);

printf(num1.to_s + "\n");
printf(num2.to_s + "\n");
printf(num3.to_s + "\n");
printf(num4.to_s + "\n");

obtain the following results:

0.166666666666666667E0
0.1666666666666667E-2
0.1666666666667E-5
0.16666663611E-7

Question: How I can fixate digits after point (in any manipulation
return 32(for example) digits after point? And the second question is
why it rounds them differently? (first gave to 18 characters, the second
16, third 13, fourth 11)

1. You can fixate the digits using printf("%f0.5", var); Just like in C.
2. This is the scientific notation[1]. The numbers are all rounder at 18 chars.

[1] Scientific notation - Wikipedia

Thank you in advance.

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Posted via http://www.ruby-forum.com/\.

Panagiotis (atmosx) Atmatzidis

email: atma@convalesco.org
URL: http://www.convalesco.org
GnuPG ID: 0x1A7BFEC5
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···

On 7 Δεκ 2013, at 16:02 , Andrey M. <lists@ruby-forum.com> wrote:
--
The wise man said: "Never argue with an idiot. They bring you down to their level and beat you with experience."