We use the - (minus, dash) symbol to indicate that a member 
uses the 𝗽𝗿𝗶𝘃𝗮𝘁𝗲 modifier.

Room
------------------
- name : String
- length : double 
- width : double
+ s͟t͟a͟n͟d͟i͟n͟g͟L͟i͟m͟i͟t : d͟o͟u͟b͟l͟e
+ s͟i͟t͟t͟i͟n͟g͟L͟i͟m͟i͟t  d͟o͟u͟b͟l͟e
------------------
+ Room()
+ Room(name : String)
+ Room(name : String, length : double, width : double)
+ getName() : String
+ setName(name : String) : void
+ getLength() : double
+ setLength(length : double) : void 
+ getWidth() : double
+ setWidth(width : double) : void
+ calculateArea() : double
+ calculatePerimeter() : double
+ displayRoom() : String
+ maxStanding() : double
+ maxSitting() : double