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C++

extern


extern tells the compiler that the variable is defined somewhere else, so it doesn't complain about it being undefined.

Syntax:
extern string-literal { declaration-list }


Example:

#include
extern int var;
extern int foo();

void main()
{
  printf("value of var from foo: %d\n", foo());
  printf("accessing var directly:%d\n ", var);
}

test1.c

int var; /*global to this file and can be extern-ed by another file*/

int foo(void)
{
   return ++var; 
}


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