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69 lines
1.9 KiB
Plaintext
69 lines
1.9 KiB
Plaintext
NAME
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issq - whether a value is a square
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SYNOPSIS
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issq(x)
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TYPES
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x real
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return int
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DESCRIPTION
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Determine if x is a square. If there exists integers a, b such that:
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x == a^2 / b^2 (b != 0)
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return 1, otherwise return 0.
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Note that issq() works on rational values, so:
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issq(25/16) == 1
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If you want to test for prefect square integers, you need to exclude
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non-integer values before you test:
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isint(curds) && issq(curds)
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EXAMPLE
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; print issq(25), issq(3), issq(0)
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1 0 1
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; print issq(4/25), issq(-4/25), issq(pi())
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1 0 0
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LIMITS
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none
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LINK LIBRARY
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BOOL qissquare(NUMBER *x)
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BOOL zissquare(ZVALUE x)
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SEE ALSO
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isassoc, isatty, isblk, isconfig, isdefined, iserror, iseven, isfile,
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ishash, isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
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isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
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issimple, isstr, istype
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## Copyright (C) 1999,2021 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1994/10/21 02:21:31
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## File existed as early as: 1994
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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