/in/foo.c: In function 'main':
/in/foo.c:6:10: error: expected identifier or '(' before ';' token
  int n,a,;
          ^
/in/foo.c:14:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'int *' [-Wformat=]
  printf("%d",&a);
           ^