流eof（）和good（） [英] Streams eof() and good()
问题描述
全部，
以下代码生成GOOD在一个平台上和EOF在
其他。
我希望它能产生EOF因为第二次阅读将结束
流。
哪个结果是正确的？
Adrian
#include< iostream>
#include< sstream>
int main（int argc， char * argv []）
{
std :: stringstream strm（" 5 4"）;
int x ;
strm> x;
strm> x;
if（strm.good（））
{
std :: cout<< GOOD \ n;
}
if（strm.eof（））
{
std :: cout<< EOF \ n;
}
返回0;
}
All,
This code below produces "GOOD" on one platform and "EOF" on the
other.
I expect it to produce "EOF" as the second read would hit the end of
the stream.
Which result is correct?
Adrian
#include <iostream>
#include <sstream>
int main(int argc, char *argv[])
{
std::stringstream strm("5 4");
int x;
strm >x;
strm >x;
if(strm.good())
{
std::cout << "GOOD\n";
}
if(strm.eof())
{
std::cout << "EOF\n";
}
return 0;
}
推荐答案
Adrian写道：
Adrian wrote:
全部，
这个下面的代码产生GOOD在一个平台上和EOF在
其他。
我希望它能产生EOF因为第二次阅读将结束
流。
哪个结果是正确的？
Adrian
#include< iostream>
#include< sstream>
int main（int argc， char * argv []）
{
std :: stringstream strm（" 5 4"）;
int x ;
strm> x;
strm> x;
if（strm.good（））
{
std :: cout<< GOOD \ n;
}
if（strm.eof（））
{
std :: cout<< EOF \ n;
}
返回0;
}
All,
This code below produces "GOOD" on one platform and "EOF" on the
other.
I expect it to produce "EOF" as the second read would hit the end of
the stream.
Which result is correct?
Adrian
#include <iostream>
#include <sstream>
int main(int argc, char *argv[])
{
std::stringstream strm("5 4");
int x;
strm >x;
strm >x;
if(strm.good())
{
std::cout << "GOOD\n";
}
if(strm.eof())
{
std::cout << "EOF\n";
}
return 0;
}
你错了。您只能可靠地告诉EOF _ after_
您试图读取_past_流结束并失败。
HTH，
- J.
You expect wrong. You can only tell EOF reliably _after_
you have tried to read _past_ the end of stream and failed.
HTH,
- J.
4月19日上午7:40，Jacek Dziedzic
< jacek.dziedzic.nosp ... @ gmail。 comwrote：
On Apr 19, 7:40 am, Jacek Dziedzic
<jacek.dziedzic.n.o.s.p....@gmail.comwrote:
你错了。您只能可靠地告诉EOF _after_
您试图读取_past_流结束并失败。
You expect wrong. You can only tell EOF reliably _after_
you have tried to read _past_ the end of stream and failed.
但是没有strm> x尝试阅读过去的eof，因为它一直在提取
chars
Adrian
But doesnt strm >x try and read past the eof as it keep extracting
chars
Adrian
Adrian写道：
Adrian wrote:
All，
以下代码生成GOOD在一个平台上和EOF在
其他。
我希望它能产生EOF因为第二次阅读将结束
流。
哪个结果是正确的？
Adrian
#include< iostream>
#include< sstream>
int main（int argc， char * argv []）
{
std :: stringstream strm（" 5 4"）;
int x ;
strm> x;
strm> x;
if（strm.good（））
{
std :: cout<< GOOD \ n;
}
if（strm.eof（））
{
std :: cout<< EOF \ n;
}
返回0;
}
All,
This code below produces "GOOD" on one platform and "EOF" on the
other.
I expect it to produce "EOF" as the second read would hit the end of
the stream.
Which result is correct?
Adrian
#include <iostream>
#include <sstream>
int main(int argc, char *argv[])
{
std::stringstream strm("5 4");
int x;
strm >x;
strm >x;
if(strm.good())
{
std::cout << "GOOD\n";
}
if(strm.eof())
{
std::cout << "EOF\n";
}
return 0;
}
它应该是好的。你获得EOF的平台是什么？
Zeppe
It should be GOOD. What is the platform in which you are obtaining EOF?
Zeppe
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