问题描述：
cin.clear(istream::failbit)和cin.clear()的区别
while(in>>ival,in.eof())
{
if(in.bad ())
throw runtime_error("stream corrupted");
if(in.fail ())
{
cerr
while(in>>ival,in.eof())
{
if(in.bad ())
throw runtime_error("stream corrupted");
if(in.fail ())
{
cerr
问题解答：
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