关于C++中文件流的问题想问一下大家

#include<iostream>

#include<fstream>

#include<sstream>

#include<string>

#include<vector>

using namespace std;



int fileToVector(string fileName, vector<string>& svec)

{

    //创建ifstream对象inFile并绑定到由形参fileName指定的文件 

    ifstream inFile(fileName.c_str());

    if (!inFile)

        return 1;

    

    string s;

    while (getline(inFile, s))

        svec.push_back(s);

    inFile.close();

    if (inFile.eof())

        return 4;

    if (inFile.bad())

        return 2;

    if (inFile.fail())

        return 3;

}



int main( void )

{

    vector<string> svec;

    string fileName, s;

    

    //读入文件名 

    cout << "Enter filename :" << endl;

    cin >> fileName;

    

    //处理文件 

    switch (fileToVector(fileName, svec))

    {

        case 1:

             cout << "error: can not to open file: "

                  << fileName << endl;

             return -1;

        case 2:

             cout << "error: system failure " << endl;

             return -1;

        case 3:

             cout << "error: read failure " << endl;

             return -1;

    }

    

    string word;

    istringstream isstream;

    for (vector<string>::iterator iter = svec.begin();

        iter != svec.end(); ++iter)

        { 

            isstream.str(*iter);

            while (isstream >> word)

            {

                cout << word << endl;

            }

            isstream.clear();

        }

    system("pause");

    return 0;

}