Ruby Program Exits After Executing Code in Command Prompt

I took a look at your code, i recommend when ever you face problems of this kind to run the command ruby -wc file_name.rb , this is what it printed out:

list.rb:22: warning: *' after local variable or literal is interpreted as binary operator

list.rb:22: warning: even though it seems like argument prefix

list.rb:24: warning: mismatched indentations at 'end' with 'def' at 21

list.rb:38: warning: mismatched indentations at 'end' with 'def' at 27

Syntax OK

So after fixing the indentations the next thing you have to fix is the method print_separator:

def print_separator(character="-")
     puts character *80
end

Change it to:

def print_separator()
    80.times do |n|
      print "-"
    end
    puts
end

Here also is a working version of the same code:

def create_list
  print "What is the list name? "
  name=gets.chomp

  hash={"name"=>name,"items"=>Array.new}
  return hash
end

def add_list_item
  print "What is the item called? "
  item_name=gets.chomp

  print "How much? "
  quantity=gets.chomp.to_i

  hash={"name"=>item_name, "quantity"=>quantity}
  return hash
end


def print_separator()
    80.times do |n|
       print "-"
    end
    puts
end


def print_list(list)
  puts "List: #{list['name']}"
  print_separator()

  list["items"].each do |item|
    puts "\tItem: " + item['name'] + "\t\t\t" +
    "Quantity: " + item['quantity'].to_s
  end
  print_separator()
end

list=create_list()
list['items'].push(add_list_item())
list['items'].push(add_list_item())

puts "Here is your list: \n"
print_list(list)

Output:

What is the list name? My list
What is the item called? apple
How much? 2
What is the item called? orange
How much? 2
Here is your list:
List: My list --------------------------------------------------------------------------------
Item: apple Quantity: 2
Item: orange Quantity: 2
--------------------------------------------------------------------------------