Syntax

EVALuate ($<$evaluate-statement$>$)

is a control statement.

$<$evaluate-statement$>$:==

$<$symbol$>$ = $<$operation$>$

$<$operation$>$:==

$<$vflc$>$ [$<$op$>$ $<$operation$>$ ]

$<$op$>$:==

$+$

denotes addition or concatenation for strings.

$-$

denotes subtraction or unary minus or negative concatenation for strings.

$*$

denotes multiplication.

$/$

denotes division.

^

denotes exponentiation.

$**$

denotes exponentiation (same as ^ ).

$<$vflc$>$:==

$<$function$>\vert<$symbol$>\vert<$real$>\vert<$integer$>\vert<$string$>$ deals with the fact that the data types of the operations and operands have to match; otherwise an error message is issued. The available functions, such as SIN, COS, and TAN, are defined in Section 2.16.