# math¶

Evaluate a mathematical expression.

```
math(EXPR <variable> "<expression>" [OUTPUT_FORMAT <format>])
```

Evaluates a mathematical `<expression>`

and sets `<variable>`

to the
resulting value. The result of the expression must be representable as a
64-bit signed integer.

The mathematical expression must be given as a string (i.e. enclosed in
double quotation marks). An example is `"5 * (10 + 13)"`

.
Supported operators are `+`

, `-`

, `*`

, `/`

, `%`

, `|`

, `&`

,
`^`

, `~`

, `<<`

, `>>`

, and `(...)`

; they have the same meaning
as in C code.

Hexadecimal numbers are recognized when prefixed with `0x`

, as in C code.

The result is formatted according to the option `OUTPUT_FORMAT`

,
where `<format>`

is one of

`HEXADECIMAL`

Hexadecimal notation as in C code, i. e. starting with “0x”.

`DECIMAL`

Decimal notation. Which is also used if no

`OUTPUT_FORMAT`

option is specified.

For example

```
math(EXPR value "100 * 0xA" OUTPUT_FORMAT DECIMAL) # value is set to "1000"
math(EXPR value "100 * 0xA" OUTPUT_FORMAT HEXADECIMAL) # value is set to "0x3e8"
```