Ken Perl wrote:
: what is the meaning of non-lvalue in the error?
Binary operators take a left hand side value and
a right hand side value. The equal (=) operator, for
example, assigns the right hand side to the left hand
side.
left hand side = right hand side
Some values can only belong to the right hand
side of a binary operator. A constant, for example,
cannot be on the left hand side.
4 = 5; # Not allowed. 4 is a constant.
Another (perhaps more correct?) name for the left
hand side value is "lvalue" and a subroutine cannot
(normally) be an lvalue.
center() = 5; # Produces the non-lvalue error.
HTH,
Charles K. Clarkson
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