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Some folks might think: “you still use RCS”?!? And we will say, hey, at least we switched from SCCS to RCS back in … I think it was around 1994 ... at least we are keeping up! :-) :-) :-) Logs say that SCCS version 18 became RCS version 19 on 1994 March 18. RCS served us well. But now it is time to move on. And so we are switching to git. Calc releases produce a lot of file changes. In the 125 releases of calc since 1996, when I started managing calc releases, there have been 15473 file mods!
94 lines
2.8 KiB
Plaintext
94 lines
2.8 KiB
Plaintext
NAME
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newerror - create or recall a described error-value
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SYNOPSIS
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newerror([str])
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TYPES
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str string
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return error-value
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DESCRIPTION
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If str is not "" and has not earlier been used as an argument for
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this function, newerror(str) creates a new described error-value so
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that any future use of newerror(str) with the same str will return
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the same error-value.
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If x = newerror(str), both strerror(x) and strerror(iserro(x)) will
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return str and iserror(x) will return the error code value of the
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new error.
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The null cases newerror() and newerror("") are equivalent to
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newerror("???").
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EXAMPLE
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Note that by default, errmax() is 0 so unless errmax() is
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increased you will get:
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; ba = newerror("curds n' whey");
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Error 20000 caused errcount to exceed errmax
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; errmax(errcount()+5)
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0
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; e1 = newerror("triangle side length <= 0")
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; iserror(e1)
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20000
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; error(20000)
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Error 20000
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; strerror(error(20000))
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"triangle side length <= 0"
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; strerror(e1);
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"triangle side length <= 0"
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; strerror(error(iserror(e1)))
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"triangle side length <= 0"
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; define area(a,b,c) {
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;; local s;
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;; if (!(a > 0) || !(b > 0) || !(c > 0)) return e1;
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;; s = (a + b + c)/2;
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;; if (s <= a || s <= b || s <= c) return newerror("Non-triangle sides");
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;; return sqrt(s * (s - a) * (s - b) * (s - c));
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;; }
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"area" defined
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; A = area(8,2,5);
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; if (iserror(A)) print strerror(A) : ":", iserror(A);
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Non-triangle sides: 20001
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; A = area(-3,4,5)
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; if (iserror(A)) print strerror(A) : ":", iserror(A);
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triangle side length <= 0: 20000
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LIMITS
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The number of new described error-values is not to exceed 12767.
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LINK LIBRARY
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none
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SEE ALSO
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errmax, errcount, error, strerror, iserror, errno, errorcodes,
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stoponerror
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## Copyright (C) 1999-2006 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: 1996/04/30 03:39:56
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## File existed as early as: 1996
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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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