Compilare: user.cpp: In function ‘int main()’: user.cpp:106: warning: format ‘%.3f’ expects type ‘double’, but argument 2 has type ‘long double’ user.cpp:106: warning: format ‘%.3f’ expects type ‘double’, but argument 3 has type ‘long double’ user.cpp:105: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result