关于I/O的问题

jianfengshxy 2008-03-13 01:31:45

这个程序是用来比较list和vect的数据是否完全相等.
问题在于输入vect数据时无法结束本此输入,如果按ctrl+d就结束程序了,无法输入list数据.
以前遇到while(cin>>ival)时我都是按ctrl+d结束输入的,后面的程序正常进行,不知道这次为什么不形?
(in linux)

#include<iostream>
#include<list>
#include<vector>
using namespace std;

int main()
{
vector<int> ivec;
list<int> ilst;
int ival;

cout<<"the vetor's numbers"<<endl;
while(cin>>ival)
ivec.push_back(ival);

cout<<"the list's numbers"<<endl;
while(cin>>ival)
ivec.push_back(ival);

cin.clear();

vector<int>::const_iterator vecit=ivec.begin();
list <int>::const_iterator lstit=ilst.begin();

if(ilst.size()!=ivec.size())
{
cout<<"they are not same"<<endl;
return 0;
}
else
{ for(;vecit!=ivec.end(),lstit!=ilst.end();++vecit,++lstit)
{
if(*vecit!=*lstit)
{ cout<<"they are not same"<<endl;
return 0;
}
}
cout<<"they are same!"<<endl;
}
return 0;
}

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i_coding 2008-03-14

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楼上的老兄，貌似只用cin.clear（）；来重设有效状态是不行的，贴这么的错误代码出来干嘛呢。

只用cin.clear()至少在vs.net 2003是运行错误的吧。

i_coding 2008-03-13

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加了两条代码，这要问题就是cin流的状态和缓冲区的问题

#include <iostream> 

#include <list> 

#include <vector> 

#include <limits> //<----添加此头文件

using namespace std; 



int main(void) 

{ 

	vector <int>  ivec; 

	list <int>  ilst; 

	int ival; 

	cout << "the vetor's numbers" << endl; 

	while(cin >> ival) 

		ivec.push_back(ival);

	cin.clear(); //<-----这里

	cin.ignore(std::numeric_limits<streamsize>::max(),'\n'); // <-----这里

	cout << "the list's  numbers" << endl;

	while(cin >> ival) 

		ilst.push_back(ival); //<-------这里 

	vector <int> ::const_iterator vecit = ivec.begin(); 

        list  <int> ::const_iterator lstit = ilst.begin(); 

	if(ilst.size() != ivec.size()) 

    { 

         cout << "they are not same" << endl;

         return 0;    

     } 

	else 

	{   

		for( ; vecit != ivec.end(), lstit != ilst.end(); ++vecit, ++lstit) 

        { 

			if(*vecit != *lstit) 

            {  

				cout << "they are not same" << endl; 

                return 0; 

            } 

         } 

		cout << "they are same!" << endl; 

    } 

	return 0; 

}

Lynn_Ran 2008-03-13

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#include <iostream>

#include <list>

#include <vector>

using namespace std;



int main()

{

    vector <int>  ivec;

    list <int>    ilst;

    int ival;



    cout <<"the vetor's numbers" <<endl;

    while(cin>>ival)

        ivec.push_back(ival);



    cin.clear();//<=========增加这个



    cout <<"the list's  numbers" <<endl;

    while(cin>> ival)

        ilst.push_back(ival);//<=========容器写错了



    cin.clear();



    vector <int> ::const_iterator vecit=ivec.begin();

    list  <int> ::const_iterator lstit=ilst.begin();



    if(ilst.size()!=ivec.size())

    {

        cout <<"they are not same" <<endl;

        return 0;

    }

    else

    {   for(;vecit!=ivec.end(),lstit!=ilst.end();++vecit,++lstit)

        {

            if(*vecit!=*lstit)

            {  cout <<"they are not same" <<endl;

                return 0;

            }

        }

        cout <<"they are same!" <<endl;

    }

    return 0;

}

Lynn_Ran 2008-03-13

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#include <iostream>

#include <list>

#include <vector>

using namespace std;



int main()

{

    vector <int>  ivec;

    list <int>    ilst;

    int ival;



    cout <<"the vetor's numbers" <<endl;

    while(cin>>ival)

        ivec.push_back(ival);



    cin.clear();//<=========增加这个



    cout <<"the list's  numbers" <<endl;

    while(cin>> ival)

        ilst.push_back(ival);//<=========容器写错了



    cin.clear();



    vector <int> ::const_iterator vecit=ivec.begin();

    list  <int> ::const_iterator lstit=ilst.begin();



    if(ilst.size()!=ivec.size())

    {

        cout <<"they are not same" <<endl;

        return 0;

    }

    else

    {   for(;vecit!=ivec.end(),lstit!=ilst.end();++vecit,++lstit)

        {

            if(*vecit!=*lstit)

            {  cout <<"they are not same" <<endl;

                return 0;

            }

        }

        cout <<"they are same!" <<endl;

    }

    return 0;

}

Lynn_Ran 2008-03-13

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#include <iostream>

#include <list>

#include <vector>

using namespace std;



int main()

{

    vector <int>  ivec;

    list <int>    ilst;

    int ival;



    cout <<"the vetor's numbers" <<endl;

    while(cin>>ival)

        ivec.push_back(ival);



    cin.clear();//<=========增加这个



    cout <<"the list's  numbers" <<endl;

    while(cin>> ival)

        ilst.push_back(ival);//<=========容器写错了



    cin.clear();



    vector <int> ::const_iterator vecit=ivec.begin();

    list  <int> ::const_iterator lstit=ilst.begin();



    if(ilst.size()!=ivec.size())

    {

        cout <<"they are not same" <<endl;

        return 0;

    }

    else

    {   for(;vecit!=ivec.end(),lstit!=ilst.end();++vecit,++lstit)

        {

            if(*vecit!=*lstit)

            {  cout <<"they are not same" <<endl;

                return 0;

            }

        }

        cout <<"they are same!" <<endl;

    }

    return 0;

}

Lynn_Ran 2008-03-13

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#include <iostream>

#include <list>

#include <vector>

using namespace std;



int main()

{

    vector <int>  ivec;

    list <int>    ilst;

    int ival;



    cout <<"the vetor's numbers" <<endl;

    while(cin>>ival)

        ivec.push_back(ival);



    cin.clear();//<=========增加这个



    cout <<"the list's  numbers" <<endl;

    while(cin>> ival)

        ilst.push_back(ival);//<=========容器写错了



    cin.clear();



    vector <int> ::const_iterator vecit=ivec.begin();

    list  <int> ::const_iterator lstit=ilst.begin();



    if(ilst.size()!=ivec.size())

    {

        cout <<"they are not same" <<endl;

        return 0;

    }

    else

    {   for(;vecit!=ivec.end(),lstit!=ilst.end();++vecit,++lstit)

        {

            if(*vecit!=*lstit)

            {  cout <<"they are not same" <<endl;

                return 0;

            }

        }

        cout <<"they are same!" <<endl;

    }

    return 0;

}

Lynn_Ran 2008-03-13

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#include <iostream> 

#include <list> 

#include <vector> 

using namespace std; 



int main() 

{ 

  vector <int>  ivec; 

  list <int>    ilst; 

  int ival; 



  cout < <"the vetor's numbers" < <endl; 

  while(cin> > ival) 

      ivec.push_back(ival); 



  cin.clear(); //记得把输入流清空下



  cout < <"the list's  numbers" < <endl; 

  while(cin> > ival) 

      ilst.push_back(ival); //这里的ivec.push_back(ival); 写错了

   

   cin.clear(); 



   vector <int> ::const_iterator vecit=ivec.begin(); 

    list  <int> ::const_iterator lstit=ilst.begin(); 



   if(ilst.size()!=ivec.size()) 

   { 

       cout < <"they are not same" < <endl; 

       return 0;    

   } 

   else 

   {   for(;vecit!=ivec.end(),lstit!=ilst.end();++vecit,++lstit) 

         { 

            if(*vecit!=*lstit) 

             {  cout < <"they are not same" < <endl; 

                 return 0; 

              } 

           } 

        cout < <"they are same!" < <endl; 

    } 

  return 0; 

}

jianfengshxy 2008-03-13

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谢谢了,第一次输入结束后应该清除状态

jianfengshxy 2008-03-13

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谢谢了,第一次输入结束后应该清除状态

jianfengshxy 2008-03-13

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谢谢了,第一次输入结束后应该清除状态

jianfengshxy 2008-03-13

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谢谢,第一次输入后忘了清除状态了.有了这次教训我想我以后一定记住了.

珍惜生命远离CPP 2008-03-13

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#include <iostream>

#include <list>

#include <vector>

using namespace std;



int main()

{

    vector <int>  ivec;

    list <int>    ilst;

    int ival;



    cout <<"the vetor's numbers" <<endl;

    while(cin>>ival)

        ivec.push_back(ival);



    cin.clear();//<=========增加这个



    cout <<"the list's  numbers" <<endl;

    while(cin>> ival)

        ivec.push_back(ival);



    cin.clear();



    vector <int> ::const_iterator vecit=ivec.begin();

    list  <int> ::const_iterator lstit=ilst.begin();



    if(ilst.size()!=ivec.size())

    {

        cout <<"they are not same" <<endl;

        return 0;

    }

    else

    {   for(;vecit!=ivec.end(),lstit!=ilst.end();++vecit,++lstit)

        {

            if(*vecit!=*lstit)

            {  cout <<"they are not same" <<endl;

                return 0;

            }

        }

        cout <<"they are same!" <<endl;

    }

    return 0;

}