Compilare: user.cpp: In function ‘void init()’: user.cpp:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main(int, const char**)’: user.cpp:60: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x user.cpp:60: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x