Enters calculator mode. In calculator mode, LUX acts like a regular
calculator: it has a current numerical scalar or array, or string value,
(stored in variable
$) which is modified by calculator
commands, and which value is displayed after each command has been
completed. Calculator mode can only be entered from the main execution
level (i.e., not from within a function or subroutine), and no
statements other than assignments and
return can be executed.
Each newline ends a command. The result of each command replaces the
current value. The following commands are supported: a numerical value;
a LUX expression; a binary operator followed by an expression (the
current value is taken for the first operand); the name of a
single-argument function (the current value is taken for the operand);
an equal sign followed by an expression; or the
which exits calculator mode.
Not all LUX expressions are supported. If the command is a single name,
then it is taken to be the name of a single-argument function rather
than the name of a variable (forming an expression). If you wish to
assign the value of a variable to the current value, then prepend an
equal sign. If you wish to evaluate a multi-argument function, then use
$ if you want the current value for one or more of its arguments.
See also: Running