Compilare: user.cpp: In function ‘void read()’: user.cpp:19:30: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 3 has type ‘long long int*’ [-Wformat=] fscanf(in, "%ld", &number); ^ user.cpp:19:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%ld", &number); ^