Compilare: user.cpp: In member function ‘hpstream& hpstream::operator>>(int&)’: user.cpp:32:18: warning: unused variable ‘sgn’ [-Wunused-variable] char ch, sgn=1; ^ user.cpp: In member function ‘hpstream& hpstream::operator>>(i64&)’: user.cpp:46:18: warning: unused variable ‘sgn’ [-Wunused-variable] char ch, sgn=1; ^ user.cpp: In member function ‘char hpstream::nextch()’: user.cpp:18:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(str, 1, BMAX, file); ^