gistfile1.txt

~> irb
1.9.3-p194 :001 > 10.0 / 0.0
 => Infinity
1.9.3-p194 :002 > 0.0 / 0.0
 => NaN
1.9.3-p194 :003 > 10 / 0
ZeroDivisionError: divided by 0
        from (irb):3:in `/'
        from (irb):3
        from /Users/thomasstuart/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'
1.9.3-p194 :004 > 10 / 0.0
 => Infinity
1.9.3-p194 :005 > Nan
NameError: uninitialized constant Nan
        from (irb):5
        from /Users/thomasstuart/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'
1.9.3-p194 :006 > NaN
NameError: uninitialized constant NaN
        from (irb):6
        from /Users/thomasstuart/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'
1.9.3-p194 :007 > Infinity
NameError: uninitialized constant Infinity
        from (irb):7
        from /Users/thomasstuart/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'
1.9.3-p194 :008 > infin = 10 / 0.0
 => Infinity
1.9.3-p194 :009 > infin
 => Infinity
1.9.3-p194 :010 > infin.class
 => Float
1.9.3-p194 :011 > nan = 0.0 / 0.0
 => NaN
1.9.3-p194 :012 > nan.class
 => Float