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OCR: Chapter Intraprogram Communication the top of the source file extern int globalvar: case so it The ables tional should identifier definition and Since 11 be keyword to restrictions ofa could indicates resol global lowerease be be lved extern variable that on may rescarched variables shorter during the the is and not used ifit can an the for be variable has be with each link made extern is linked external phase used This defined compiler. decl to declarations is of The I linkage. not other laration elsewhere; but compilation. are allowed and source specified not different. by files, with distinction references maximum Note the there that to definitions ANSI may between length this an be of standards of variable external upper- addi- vari- the identifiers needs files variable, display in be ...