Lua 简单的IO交互 和迷宫代码

 function room1 ()
     print("in room1")
     local move = io.read()
     if move == "south" then
        return room3()
     elseif move == "east" then
        return room2()
     else
        print("invalid move")
        return room1()   -- stay in the same room
     end
 end

 function room2 ()
     print("in room2")
     local move = io.read()
     if move == "south" then
        return room4()
     elseif move == "west" then
        return room1()
     else
        print("invalid move")
        return room2()
     end
 end

 function room3 ()
     print("in room3")
     local move = io.read()
     if move == "north" then
        return room1()
     elseif move == "east" then
        return room4()
     else
        print("invalid move")
        return room3()
     end
 end

 function room4 ()

     print("in room4")
     print("congratilations!")
 end

 room1()

Result：

in room1

south

in room3

north

in room1

west

invalid move

in room1

north

invalid move

in room1

south

in room3

south

invalid move

in room3

east

in room4

congratilations!