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66 lines
1.9 KiB
Plaintext
66 lines
1.9 KiB
Plaintext
NAME
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swap - swap values of two variables
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SYNOPSIS
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swap(x,y)
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TYPES
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x, y lvalues, any type
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return null value
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DESCRIPTION
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swap(x,y) assigns the value of x to a temporary location, temp say,
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assigns the value of x to y, and then assigns the value at temp to y.
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swap(x,y) should not be used if the current value of one of the
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variables is a component of the value of the other; for example, after:
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A = list(1,2,3); swap(A, A[[1]]);
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A will have the value 2, but a three-member list remains in memory
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with no method within calc of recalling the list or freeing the
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memory used.
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EXAMPLE
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> x = 3/4; y = "abc"; print x, y, swap(x,y), x, y
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.75 abc abc .75
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> A = list(1,2,3); mat B[3] = {4,5,6}; swap(A[[1]], B[1]); print A[[1]], B[1]
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5 2
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LIMITS
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none
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LINK LIBRARY
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none
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SEE ALSO
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assign
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## Copyright (C) 1999 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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## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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##
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## @(#) $Revision: 29.2 $
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## @(#) $Id: swap,v 29.2 2000/06/07 14:02:33 chongo Exp $
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## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/swap,v $
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##
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## Under source code control: 1995/12/18 12:34:58
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## File existed as early as: 1995
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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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