Gamevar operators

<operator>var <gamevar> <value>
<operator>varvar <gamevar> <value>

Gamevar operators are commands that perform various mathematical and bitwise logical operations on gamevars. The first argument must be a writable gamevar and is taken as the destination as well and the first operand (2-address code).

For example:

setvar temp 3 // assigns a value of 1 to the gamevar temp.

addvar temp 1 // adds 1 to temp, causing its value to become 2.

mulvar temp 2 // multiplies temp by 2, causing its value to become 4.

Operator	C/C++	Math	Description	Notes
set	=	=	assignment
add	+	+	addition
sub	-	–	subtraction
mul	*	×	multiplication
div	/	÷	division with rounding toward 0	Ensure that <value> does not equal 0 at any time.
mod	%		modulo, remainder	Ensure that <value> does not equal 0 at any time; It is undefined whether the sign of the result follows the divisor or the dividend (for now). sign of the result is that of left hand side operand
and	&		bitwise AND	The bits in the result are set only if they were set in both of the values being operated on.
or	|		bitwise OR	The bits in the result are set only if they were set in either of the values being operated on.
xor	^		bitwise XOR	The bits in the result are set if only one of the values being operated on has those bits set.

Commands with an additional "var" suffix take gamevars rather than constants or defined labels for their inputs. As an alternate short form, "varvar" can be dropped from these commands; for example ife serves an an alias for ifvarvare.