Aliases%calculate( ), %calc( )
Parametersmixed @lOperand, string @operator, mixed @rOperand

    Historical calculation function in use by many of the old scripts. This
command is deprecated since it isn't nearly as functional as using the
eval function %( ) to evaluate any logical expression. Traditionally the
function took a left operand, an operator (+, -, *, /, %), and a right
operand and then returned the result of applying operator to the right and
left operands in INTEGER arithmetic.

DEPRECATED - use the eval function %() for calculations within commands
and just do calculations if within a logic expression like
if, elseif, or while.