/in/foo.c: In function 'main':
/in/foo.c:6:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'long int *' [-Wformat=]
  scanf("%d", &x);
          ^
/in/foo.c:22:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
  printf("%d", 10*(x%(int)(pow(10, n-2)))+c);
           ^
/in/foo.c:17:5: warning: 'xx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   xx=xx/10;
   ~~^~~~~~