/in/foo.cc: In function 'int main()':
/in/foo.cc:7:25: warning: format '%ld' expects argument of type 'long int*', but argument 2 has type 'double*' [-Wformat=]
  scanf("%ld %ld", &L, &d);
                         ^
/in/foo.cc:7:25: warning: format '%ld' expects argument of type 'long int*', but argument 3 has type 'double*' [-Wformat=]
/in/foo.cc:9:33: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'double' [-Wformat=]
   printf("%.6ld", 1 + log(L / d));
                                 ^