Compilare: user.cpp: In function ‘int main()’: user.cpp:27:27: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(os, "%d", aux ); ^ user.cpp:14:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(is, "%d", &n ); ^ user.cpp:17:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(is, "%d", &nr ); ^