Real expressions:

real-expression	:	real-term
	|	+ real-term
	|	- real-term
	|	real-expression + real-term
	|	real-expression - real-term

real-term	:	real-factor
	|	real-term * real-factor
	|	real-term / real-factor

real-factor	:	real-primary
	|	real-factor ^ real-primary

real-primary	:	real-literal
	|	symbolic-constant
	|	#
	|	real-name
	|	array [ index ]
	|	object-name -> real-attribute
	|	object-name -> array-attribute [ index ]
	|	table-reference
	|	real-function ()
	|	real-function ( real-expression )
	|	real-function ( real-expression , real-expression )
	|	function-of-array ( array-expression )
	|	( real-expression )

real-function	:	RANF
	|	GAUSS
	|	USER0
	|	SI
	|	SC
	|	SO
	|	ABS
	|	TRUNC
	|	ROUND
	|	FLOOR
	|	CEIL
	|	SIGN
	|	SQRT
	|	LOG
	|	EXP
	|	SIN
	|	COS
	|	ABS
	|	TAN
	|	ASIN
	|	ACOS
	|	ATAN
	|	TGAUSS
	|	USER1
	|	ATAN2
	|	MAX
	|	MIN
	|	MOD
	|	POW
	|	USER2

function-of-array	:	VMIN
	|	VMAX
	|	VRMS
	|	VABSMAX