Calculator language command to install Calculator language " apt-get install bc " past this command in linux terminal (without ") run this command with "bc" example :- root@kali:~# bc bc 1.06.95 Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. example to cal :- root@kali:~# bc bc 1.06.95 Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. 1+1 2 for any problem plzz comment or share here http://rockbookzz.blogspot.in/p/idforumembed-typetextjavascript.html