/in/foo.c: In function 'main':
/in/foo.c:24:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
  printf("%d",cnt*2%k);
           ^
/in/foo.c:24:17: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d",cnt*2%k);
              ~~~^~