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Binary operations in Lisp
Posted: Wed Nov 12, 2014 3:15 am
by rhjadhav
hello everyone. i am new to Lisp. i dont know how to perform binary operations in LISP?
can anyone share sample of code for binary addition or multiplication plz
Re: Binary operations in Lisp
Posted: Sat Nov 15, 2014 2:54 am
by Goheeca
A binary operation is treated as any other n-ary operation. There is nothing special about it. Use prefix notation:
Re: Binary operations in Lisp
Posted: Fri Nov 28, 2014 4:31 pm
by sylwester
Integers don't have base when they are stored. Your reader can read numbers in several different bases.
Now when makeing a string out of the number you get to choose the base:
Code: Select all
(let ((thirty (+ 10 #xa #b1010)))
(format nil "~n ~x ~o ~b" thirty thirty thirty thirty))
; ==> "30 1E 36 11110"
There you have it. 30 displayed in 4 different bases. In CL you have the special variable *print-base* which sets the default base in which numbers are printed and *read-base* which sets the default base in which numbers are read when parsed:
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(let ((*print-base* 16)
(*read-base* 2))
(princ (read-from-string "1011"))) ; ==> B
Thats about all there is to know about displaying and parsing numbers. Now all your base are belong to you
Re: Binary operations in Lisp
Posted: Tue Dec 02, 2014 6:09 am
by edgar-rft
I think the question was about
binary operations (operations that take exactly two arguments), not how to compute numbers represented in binary format. And the question smells very much like homework...