Check Fixnum

Ruby
1

Hi
I have Fixnum. I want to check does this value integer or float, i. e.
has .xx in the trail or not. How can I check this?
Thanks in advance

2

Stanislav O. wrote:

I have Fixnum. I want to check does this value integer or float, i. e.
has .xx in the trail or not. How can I check this?

“Fixnum” means “fixed point”, or really “small integer”: a Fixnum can
never be a float.

$ irb --simple-prompt

3.is_a?(Fixnum)
=> true

3.0.is_a?(Fixnum)
=> false

3.0.is_a?(Integer)
=> false

3.0.is_a?(Float)
=> true

3.0.is_a?(Numeric)
=> true

3

2010/6/15 Stanislav O. [email protected]

Hi
I have Fixnum. I want to check does this value integer or float, i. e.
has .xx in the trail or not. How can I check this?
Thanks in advance

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

check your reference…
Fixnum are Integers, not float…
you are probably mislead by Numeric… because Integer and Float are
Numeric

a = 0.1
a.class
=> Float

b = 1
b.class
=> Fixnum

a.is_a? Numeric
=> true

b.is_a? Numeric
=> true

4

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Hey,

On Tuesday 15 June 2010, Stanislav O. [email protected]
wrote:

Hi
I have Fixnum. I want to check does this value integer or float, i. e.
has .xx in the trail or not. How can I check this?
Thanks in advance

Mathematically by doing a modulo division by 1:

  • —%<—
    irb(main):001:0> i = 5
    => 5
    irb(main):002:0> j = 5.2
    => 5.2
    irb(main):003:0> j %1
    => 0.2
    irb(main):004:0> i%1
    => 0
  • —>%—

HTH.
Eric
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