Numeric functions

Name	Explanation
abs
atan2	pi = atan2(1, 1) * 4
cos	EXPR in radians
exp	e to the power of EXPR.
	The ** operator does general exponentiations.
hex	Interprets EXPR as a hex-string
	and returns a decimal number
	Inverse: $str = sprintf "%lx", $i; # an ell
int	The integer portion of EXPR
log	base e
oct	Interprets EXPR as an octal string
	and returns a decimal number
	$val = oct $val if $val =~ /^0/;
	Inverse: sprintf "%lo", $i; # an ell
rand	Returns a random fractional number
	between 0 and EXPR (or 1)
sin	EXPR in radians
sqrt
srand	Sets the random seed,
	default: srand( time);