/in/foo.c: In function 'main':
/in/foo.c:6:13: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'long int *' [-Wformat=]
     scanf("%d", &n);
             ^
/in/foo.c:13:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
     printf("%d", s);
              ^
/in/foo.c:4:17: warning: unused variable 'x' [-Wunused-variable]
     long n,s =0,x;
                 ^