/in/foo.c: In function 'main':
/in/foo.c:21:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf("%d%d",x,n);
          ^
/in/foo.c:21:12: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
  scanf("%d%d",x,n);
            ^
/in/foo.c:21:2: warning: 'x' is used uninitialized in this function [-Wuninitialized]
  scanf("%d%d",x,n);
  ^~~~~~~~~~~~~~~~~
/in/foo.c:21:2: warning: 'n' is used uninitialized in this function [-Wuninitialized]