Actions

EmSys

Difference between revisions of "C - External variables2"

From EdWiki

m (1 revision)
 
m (1 revision imported: EdWiki -- Emsys pages from Shukra)
 
(No difference)

Latest revision as of 09:30, 23 June 2015

External variables ...

  • If the program is in several source files, and a global variable is defined in file1.c and used in file2.c and file3.c, then extern declarations are needed in file2.c and file3.c to connect the occurrences of the variable.
  • The ANSI C standard calls this as external linkage.
  • In C, all functions are global and provide external linkage by default.