Compilare: user.c: In function ‘main’: user.c:14:17: warning: format ‘%u’ expects argument of type ‘unsigned int *’, but argument 3 has type ‘long long unsigned int *’ [-Wformat=] fscanf(fp,"%ull",&n); ^ user.c:36:18: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 3 has type ‘long long unsigned int’ [-Wformat=] fprintf(fp,"%ull",res); ^ user.c:14:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%ull",&n); ^~~~~~~~~~~~~~~~~~~~