Wu Yuxiong - natural born C language development: storage class

{
   int mount;
   auto int month;
}

{
   register int  miles;
}

#include <stdio.h>
 
/ * Function declaration * / 
void func1 ( void );
 
static  int COUNT = 10 ;         / * global variables - static is the default * /
 
int main ()
{
  while (count--) {
      func1 ();
  }
  return 0;
}
 
void func1(void)
{
/ * 'Thingy' is 'func1' local variables - initialized only once
 * Each call function 'func1' 'thingy' value is not reset.
 */                
  static int thingy=5;
  thingy++;
  printf(" thingy 为 %d ， count 为 %d\n", thingy, count);
}

#include <stdio.h>
 
int count ;
extern void write_extern();
 
int main()
{
   count = 5;
   write_extern();
}

#include <stdio.h>
 
extern int count;
 
void write_extern(void)
{
   printf("count is %d\n", count);
}