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Expr::Node(3)	      User Contributed Perl Documentation	 Expr::Node(3)

	 Math::Expr::Num - A node in the expretion tree, used as superclass only

	 package Math::Expr::Num;
	 require Math::Expr::Node;

	 use Math::Expr::Node;
	 use vars qw(@ISA);
	 @ISA =	qw(Math::Expr::Node);

	 Each expretion	is represented by a tree where each opperation and variable
	 is a separate node. This class	contain	the common code	for all	those noeds.

	 It also defines all the common	methods	used in	those node classes and does
	 some typecheckinig for	them. Therefor the methodname in the subclasses
	 should	start with a '_'-char followed by the actually method name. This
	 method	will be	called by the acutall method in	this class after the
	 typecheking is	done.

perl v5.32.0			  1998-09-01			 Expr::Node(3)


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