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Define v.s. Declare

原创 IT综合 作者:AlexQin 时间:2011-09-27 20:49:48 0 删除 编辑
A variable is  defined  if, and only if, the lvalue  column for that variable in the symbol table has a memory address assigned to it. When you  declare  a variable, the lvalue column in the symbol table for that variable does not contain a memory address. 

The  lvalue  of a variable was an abbreviation for its "location value."

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