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#

#   Dos9 Manual pages, The Dos9 project

#   Copyright (C) 2012-2013  Romain Garbi (DarkBatcher)

#

#   This program is free software: you can redistribute it and/or modify

#   it under the terms of the GNU General Public License as published by

#   the Free Software Foundation, either version 3 of the License, or

#   (at your option) any later version.

#

#   This program is distributed in the hope that it will be useful,

#   but WITHOUT ANY WARRANTY; without even the implied warranty of

#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#   GNU General Public License for more details.

#

#   You should have received a copy of the GNU General Public License

#   along with this program.  If not, see <http://www.gnu.org/licenses/>.

#



{{SET command (/A)(integers)}}



	Evaluate a mathematical expression and assign the result to a variable.



	This manual is about the {/A} switch from the {set|SET} command, when

	using integers. For floating point arithmetics, please check

	{setaf|SET (/A)(Floats)}.



{{Synopsis}}



${SET [/a | /a[:]i] variable=expression}



	Evaluate an expression and assign the result to a variable.



	The assign operator {=} can be replaced in the synopsis by one of the

	following operators:



	- Arithmetic operators :



		-- {+=} : Add result to {variable}.



		-- {-=} : Substract result to {variable}.



		-- {*=} : Multiply {variable} by the result.



		-- {/=} : Divide {variable} by the result.



	 - Logical operators :



		-- {&&=} : Logical and between {variable} and the result.



		-- {\|\|=} : Logical or between {variable} and the result.



	- Bitwise operators :



		-- {&=} : Bitwise and between {variable} and the result.



		-- {\|=} : Bitwise or between {variable} and the result.



		-- {^=} : Bitwise xor between {variable} and the result.



		-- {>>=} : Bitwise left shift of {variable} by result bits.



		-- {<<=} : Bitwise right shift of {variable} by result bits.



{{Operators}}



	A mathematical expression is made of operators and operands. Every

	opperand is separated from other opperands by an operator.



	Interger arithmetics operators are:



	- Arithmetic operators :



		-- {*} : product.



		-- {/} : division.



		-- {%} : Modulo.



		-- {+} : Addition.



		-- {-} : Subtraction.

		

		-- {=} : Assignment.



	- Bitwise operators:



		-- {\|} : Bitwise or.



		-- {^} : Bitwise xor.



		-- {&} : Bitwise and.



		-- {>>} : Right shift.



		-- {<<} : Left shift.



	- Logical operators:



		-- {\|\|} : Logical or.



		-- {&&} : Logical and.





	Operators have the following precedence (from greatest to lowest):



	- {unary operators}

	

	- {=}

	

	- {*}, {/}, {%}



	- {+}, {-}



	- {>>}, {<<}



	- {&&}, {&}



	- {^}



	- {\|\|}, {\|}



	To avoid precedence issue, use the parenthesis {(} and {)}.



	{dos9|Dos9} also include unary operators. Unary operators should be to

	the left of the opperand it affects. Unary operators provided by {Dos9}

	are:



	- {-} : Negation.



	- {~} : Bitwise not.



	- {!} : Logical not.



	Unary operators have the highest precedence.



{{Bases}}



	In {dos9|Dos9} mathematical expressions, numbers can be specified in

	three different numeric bases: decimal, octal and hexadecimal. By

	default, numbers are suposed to be decimal, unless it is prefixed

	by one of the following prefix:



		- {0x} : Hexadecimal number.



		- {0} : Octal number.



{{Note}}



	This command uses {libinteval}, a parser compiled with {YACC}.



{{Compatibility}}



	Fully compatible with {cmd.exe}. {&&} and {\|\|} are Dos9 extensions.



	Available since version {0.7.1.0}.



{{See also}}



	{set|SET command}, {setaf|SET command (/A)(floats)},

	{setlocal|SETLOCAL command}