1  #include <stdio.h>
       2  
       3  extern int bar (void);
       4  
       5  int times = -1;
       6  int time1;
       7  
       8  int
       9  main ()
      10  {
      11    printf ("times: %d\n", times);
      12    times = 20;
      13    printf ("times: %d\n", times);
      14  
      15    printf ("time1: %d\n", time1);
      16    time1 = 10;
      17    printf ("time1: %d\n", time1);
      18    bar ();
      19  
      20    return 0;
      21  }