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58 lines
2.7 KiB
Plaintext
58 lines
2.7 KiB
Plaintext
Expression sequences
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This is a sequence of statements, of which expression statements
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are the commonest case. Statements are separated with semicolons,
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and the newline character generally ends the sequence. If any
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statement is an expression by itself, or is associated with an
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'if' statement which is true, then two special things can happen.
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If the sequence is executed at the top level of the calculator,
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then the value of '.' is set to the value of the last expression.
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Also, if an expression is a non-assignment, then the value of the
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expression is automatically printed if its value is not NULL.
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Some operations such as pre-increment and plus-equals are also
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treated as assignments.
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Examples of this are the following:
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expression sets '.' to prints
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---------- ----------- ------
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3+4 7 7
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2*4; 8+1; fact(3) 6 8, 9, and 6
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x=3^2 9 -
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if (3 < 2) 5; else 6 6 6
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x++ old x -
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print fact(4) - 24
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null() null() -
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Variables can be defined at the beginning of an expression sequence.
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This is most useful for local variables, as in the following example,
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which sums the square roots of the first few numbers:
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local s, i; s = 0; for (i = 0; i < 10; i++) s += sqrt(i); s
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If a return statement is executed in an expression sequence, then
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the result of the expression sequence is the returned value. In
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this case, '.' is set to the value, but nothing is printed.
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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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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1991/07/21 04:37:18
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## File existed as early as: 1991
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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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