Computers and Technology, 11.03.2021 14:00, allisonatalie6654
The following is a description for βJH-Lisp2β, which is a modified version of the
language previously described in homework 3, problem 6:
(a) The alphabet of JH-Lisp2 consists of the open β[β and close β]β square brackets,
the digits 0-9, the underscore character β β, and the letters {a, b,d, i,l, m,o, s,u, v}
(b) An operator is a substring in JH-Lisp2 containing one of the following strings:
{add, sub, mul, div, mod}.
(c) A number is a substring in JH-Lisp2 containing one or more of the digits 0-9
(d) An expression is defined as either a number or a list expression
(e) A list expression is defined by the following, in order:
i. An open bracket: β[β
ii. An operator
iii. An underscore: β β
iv. An expression
v. An underscore: β β
vi. An expression
vii. A close bracket: β]β
(f) A string in the JH-Lisp2 language is a single list expression.
An example string in this language might be [add [mod 4 3] 21]
Give a context-free grammar for JH-Lisp2.
Answers: 3
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The following is a description for βJH-Lisp2β, which is a modified version of the
language previous...
History, 04.09.2019 19:30