Stanislav Orlenko 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
>> 
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