Compilare: user.cpp: In instantiation of ‘InParsare& InParsare::operator>>(T&) [with T = int]’: user.cpp:156:12: required from here user.cpp:56:13: warning: variable ‘sgn’ set but not used [-Wunused-but-set-variable] int sgn = 1; ^ user.cpp: In instantiation of ‘InParsare& InParsare::operator>>(T&) [with T = long long int]’: user.cpp:157:26: required from here user.cpp:56:13: warning: variable ‘sgn’ set but not used [-Wunused-but-set-variable] user.cpp: In member function ‘char InParsare::read_character()’: user.cpp:36:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, CHARMAX, fin); ^