/in/foo.c: In function 'main':
/in/foo.c:6:2: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'long int *' [-Wformat=]
  scanf("%d",&n);
  ^
/in/foo.c:9:2: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
  printf("%d",a);
  ^
/in/foo.c:5:17: warning: unused variable 'i' [-Wunused-variable]
  long int a,b,c,i,n;
                 ^
/in/foo.c:5:15: warning: unused variable 'c' [-Wunused-variable]
  long int a,b,c,i,n;
               ^