converter.rb

#Author : Mitko Kostov
#E-Mail  : contact@mitkokostov.info
#Website : http://mitkokostov.info

include Math

def db2gain(n)
	x = (10**((n.to_f)/20))
end

def gain2db(n)
	x = 20*(log10(n))
end

choice = 0
 
while choice != 3
	puts
	puts " Voltage Gain <=> dB converter"
	puts
  puts "1. Convert voltage gain to decibels"
  puts "2. Convert decibels to voltage gain"
  puts "3. Quit"
  choice = gets.to_i
  if choice == 1
    print "Please, enter voltage gain: "
    i = gets.to_i
    n = gain2db(i)
    puts
    puts "#{i} in decibes is #{n}" 
  end

  if choice == 2
    print "Please, enter voltage gain: "
    i = gets.to_i
    n = db2gain(i)
    puts
    puts "#{i} in voltage gain is #{n}" 
  end
end