def something(a)
  a = 12;
  puts a
end

def somethingelse(b)
  b.map!{|i| (i - 4.00).round(2) }
  puts b
end

a = 15;
b = [1,2];

something(a)
puts a
puts "-----------------"
somethingelse(b)

puts ""

puts b



OUTPUT___________________



12
15
-----------------
-3.0
-2.0

-3.0
-2.0