math | |
---- | |
Evaluate a mathematical expression. | |
.. code-block:: cmake | |
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. | |
.. versionadded:: 3.13 | |
Hexadecimal numbers are recognized when prefixed with ``0x``, as in C code. | |
.. versionadded:: 3.13 | |
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 | |
.. code-block:: cmake | |
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" |