Compilare: user.c: In function ‘main’: user.c:16:14: warning: format ‘%u’ expects argument of type ‘unsigned int *’, but argument 3 has type ‘uint64_t * {aka long unsigned int *}’ [-Wformat=] fscanf(in, "%u%*c%u%*c", &a, &b); ^ user.c:16:14: warning: format ‘%u’ expects argument of type ‘unsigned int *’, but argument 4 has type ‘uint64_t * {aka long unsigned int *}’ [-Wformat=] user.c:17:16: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘uint64_t {aka long unsigned int}’ [-Wformat=] fprintf(out, "%llu\n", count_divs(b) - count_divs(a - 1)); ^ user.c:16:3: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%u%*c%u%*c", &a, &b); ^