Translate a column index into an Excel Column Name

Question

Given a columns\' index, how can you get an Excel column name?

The problem is trickier than it sounds because it\'s not just base-26. The columns

Answer 1

In Ruby:

class Fixnum
  def col_name
    quot = self/26
    (quot>0 ? (quot-1).col_name : "") + (self%26+65).chr
  end
end

puts 0.col_name # => "A"
puts 51.col_name # => "AZ"