/in/foo.cc: In function 'int main()':
/in/foo.cc:15:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int rear=now;rear<n;a[rear]=a[rear+1],rear++); n--;
   ^~~
/in/foo.cc:15:54: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   for(int rear=now;rear<n;a[rear]=a[rear+1],rear++); n--;
                                                      ^
/in/foo.cc:17:8: warning: 'num' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d",num);
  ~~~~~~^~~~~~~~~~