Compilare: user.cpp: In function ‘int main()’: user.cpp:11: warning: right-hand operand of comma has no effect user.cpp:13: warning: format ‘%.7lf’ expects type ‘double’, but argument 2 has type ‘int’ user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result