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Question

Which of the following is an invalid atom, in LISP

A
This_is_a_symbolic_atom
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B
Bill
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C
100004352
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D
(ab)
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Solution

The correct option is A This_is_a_symbolic_atom

This_is_a_symbolic_atom is an invalid atom, in LISP.

The atomic whirl is the logo of the American Atheists. Many American Atheist organizers claim that it come to be used as a symbol of atheism in general. It is an unrealistic and erroneous representation of what is now known as the atomic orbital functions. ... This central loop forms an "A" which represents the atheists.

In computer programming, cons (/ˈkɒnz/ or /ˈkɒns/) is a fundamental function in most dialects of the Lisp programming language. cons constructs memory objects which hold two values or pointers to values. These objects are referred to as (cons) cells, conses, non-atomic s-expressions ("NATSes"), or (cons) pairs.

'Atoms' in Clojure manage state. 'Atoms' in Lisp is a word for all data types that are not cons cells (like numbers, characters, strings, symbols, ...). In Lisp the function ATOM is simply defined as: (defun atom (object) (not (consp object)))

2.3.4 Symbol Type. A symbol in GNU Emacs Lisp is an object with a name. The symbol name serves as the printed representation of the symbol. ... Or it may serve only to be distinct from all other Lisp objects, so that its presence in a data structure may be recognized reliably.


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