Gamevar operators - EDukeWiki

# Gamevar operators

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(Redirected from Xorvar)

<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 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 base-2): 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.

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Category:

- Gamevar manipulation