Gamevar operators
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<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 (2address code).
For example:
setvar temp 1 // 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 for nonnegative dividends  Ensure that <value> does not equal 0 at any time. The rounding behavior is undefined for negative dividends.  
mod  %

modulo, remainder  Ensure that <value> does not equal 0 at any time; sign of the result is that of left hand side operand (dividend).  
and  &

bitwise AND  The bits in the result are set only if they were set in both of the values being operated on. Ex. (all numbers are base2): 01001010 AND 11110100 is 01000000  
or  

bitwise OR  The bits in the result are set only if they were set in either of the values being operated on. Ex.: 01001010 OR 11110100 is 11111110  
xor  ^

bitwise XOR  The bits in the result are set if only one of the values being operated on has those bits set. Ex.: 01001010 XOR 11110100 is 10111110 
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.