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Hi, I am having a problem understanding the concept of struct lang_identifier. At times an struct tree_identifier pointer is cast as struct lang_identifier pointer and a dereferencing is done. Please note that the size of the struct tree-identifier is 20 bytes while that of the struct lang_identifier is 32 bytes. The definitions of struct lang_identifier actually includes a node of struct tree_identifier. However in all the dereferencing of a struct tree_identifier by this casting calls on variables global_value or local_value, which are out of the 20 bytes. And while an identifier node is created, this space is not allocated. How is the code not tramping on unallocated spaces. If anyone could explain this to me, it would be extremely helpful. Regards, Manosiz. ********************************************************************** Manosiz Bhattacharyya. e:mail : mano@cse.ucsc.edu 626 Koshland Way, School of Engineering, Santa Cruz, University of California, CA-95064,USA. Santa Cruz. Phone: (res) (831)-420-1368 (off) (831)-459-5625 **********************************************************************