該string文件的位置：Microsoft Visual Studio\VC98\Include\string(註意：是string文件而不是string.h文件)，
這是geiline函數在string文件中的代碼，通過該代碼妳可以知道問什麽會出現該Bug
template<class _E, class _Tr, class _A> inline
basic_istream<_E, _Tr>& __cdecl getline(basic_istream<_E, _Tr>& _I,
basic_string<_E, _Tr, _A>& _X, const _E _D)
{typedef basic_istream<_E, _Tr> _Myis;
ios_base::iostate _St = ios_base::goodbit;
bool _Chg = false;
_X.erase();
const _Myis::sentry _Ok(_I, true);
if (_Ok)
{_TRY_IO_BEGIN
_Tr::int_type _C = _I.rdbuf()->sgetc();
for (; ; _C = _I.rdbuf()->snextc())
if (_Tr::eq_int_type(_Tr::eof(), _C))
{_St |= ios_base::eofbit;
break; }
else if (_Tr::eq((_E)_C, _D))
{_Chg = true;
//_I.rdbuf()->snextc();//註釋掉該行
_I.rdbuf()->sbumpc();//添加該行
break; }
else if (_X.max_size() <= _X.size())
{_St |= ios_base::failbit;
break; }
else
_X += _Tr::to_char_type(_C), _Chg = true;
_CATCH_IO_(_I); }
if (!_Chg)
_St |= ios_base::failbit;
_I.setstate(_St);
return (_I); }