完成练习31，综合练习if-else

ex31.rb

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+def prompt
+	print "> "
+end
+
+puts "You enter a dark room with two doors. Do you go through door #1 or door #2?"
+
+prompt; door = gets.chomp
+
+if door == "1"  # ÈçºÎ½øÐÐÀàÐÍת»»£¿
+	puts "There's a giant bear here eating a cheese cake. What do you do?"
+	puts "1. Take the cake."
+	puts "2. Scream at the bear."
+
+	prompt; bear = gets.chomp
+
+	if bear == "1"
+		puts "The bear eate your face off. Good job!"
+	elsif bear == "2"
+		puts "The bear eate your legs off. Good job!"
+	else
+		puts "Well, doing #{bear} is probably better. Bear run away."
+	end
+
+elsif door == "2"
+	puts "You stare into the endless abyss at Cthuhlu's retina."
+	puts "1. Blueberries."
+	puts "2. Yellow jacket clothespins."
+	puts "3. Understanding revolvers yelling melodies."
+
+	prompt; insanity = gets.chomp
+
+	if insanity == "1" or insanity == "2"
+		puts "Your body survives powered by a mind of jello. Good job!"
+	else
+		puts "The insanity rots your eyes into a pool of muck. Good job!"
+	end
+
+else
+	puts "You stumble around and fall on a knife and die. Good job!"
+end
+