rubyatm.rb

def atm_action(balance, action)
  case action
    when '1'  # withdrawal
    	puts "please enter the amount you wish to withdraw:"
    	amount = gets.chomp.to_f
    	if balance - amount < 0
    		puts "sorry, you don't have that much cash!"
    	else
    	    balance = balance - amount
    	end
    when '2'  # deposit
    	puts "please enter the amount you wish to deposit:"
    	amount = gets.chomp.to_f
    	balance = balance + amount
    when '3'  # show me my balance
    	puts "Your balance is:  $   #{balance}" 
      puts "Your balance is:  $   " + balance.to_s
    when 'exit'  # leave the ATM
    	puts "Thanks for banking with the Ruby ATM!"
    else
    	puts "Invalid selection, try again!"
  end 
 
  return balance
end
# code starts executing here
puts "Hello! What's your name?"
name = gets.chomp

# puts "Welcome to the Ruby ATM.  Please enter your initial deposit:"
# balance = gets.chomp.to_f
balance = 100.25

action = ""
while action != 'exit'
   puts " "
   puts "Please enter your selection:"
   puts "  * Enter 1 for withdrawals "
   puts "  * Enter 2 for deposits "
   puts "  * Enter 3 to check your balance "
   puts "  * Enter exit to leave the Ruby ATM "

   action = gets.chomp.downcase

   balance = atm_action(balance, action)
   puts "Transaction complete."
end