╔═══╗──╔╗──────╔╗───╔╗ ║╔═╗║──║║──────║║──╔╝╚╗ ║║─╚╬══╣║╔══╦╗╔╣║╔═╩╗╔╬══╦═╗ ║║─╔╣╔╗║║║╔═╣║║║║║╔╗║║║╔╗║╔╝ ║╚═╝║╔╗║╚╣╚═╣╚╝║╚╣╔╗║╚╣╚╝║║ ╚═══╩╝╚╩═╩══╩══╩═╩╝╚╩═╩══╩╝

 Your_Calculation"   
 for_addition : type `add`   
 for_multiplication : `multiply`  
 for_division : `divide`   
 for_subtration : `subtract`  
 for_square_root: `root`  
 for_cancle_processing :`clear`
 for_percentage : `percentage`