External Variables

Variables that are declared in a source file outside the scope of main or any subroutine are called external variables. In the following example, pageCount is an external variable:

int pageCount;

main()
{
...
  printf("The current page count is: %d\n", pageCount );
}

void addpage()
{
  pageCount++;
  ...
}

void deletePage
{
  pageCount--;
  ...
}