Compilare: user.cpp: In function ‘int main()’: user.cpp:46: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘long long unsigned int’ user.cpp:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result