编写了一个输入输出类，前面运行都没问题，但到了最后一个输入输出就中断，请问是什么原因？程序如下
class DataBankbyInput
{
public:

    DataBankbyInput( );
    void InputBasic(int& NELEM,int& NPOIN,int& NDIME,int& NNODE,
                    int& Nx,int& Ny,double& Dtime,double& Ttime);
    void InputBasicData(int** Lnods,double** Coord,double* InitialValue,double* dCbar);
    ~DataBankbyInput(){};
};


DataBankbyInput::DataBankbyInput( )
{
}
                    
void DataBankbyInput::InputBasic(int& NELEM,int& NPOIN,int& NDIME,int& NNODE,
                                 int& Nx,int& Ny,double& Dtime,double& Ttime)
{
    ifstream inputfile;
    string fname1;
    cout<<"Enter the name of the FIRST input file"<<endl;
    cin>>fname1;
    inputfile.open(fname1.c_str());
    if(inputfile.fail())
    {
        cout<<"The first file inputfile could not be opened"<<endl;
        exit(2);
    }

//
    ofstream outputfile;
    string fname0;
    cout<<"Enter the name of the SECOND output file"<<endl;
    cin>>fname0;
    outputfile.open(fname0.c_str());
    if(outputfile.fail())
    {
        cout<<"The second file outputfile could not be opened"<<endl;
        exit(2);
    }

//   READ THE FIRST DATA CARD, AND ECHO IT IMMEDIATELY.

    inputfile>>NELEM>>NPOIN>>NDIME>>NNODE>>Nx>>Ny;
    outputfile<<"NELEM="<<NELEM<<" NPOIN="<<NPOIN<<" NDIME="<<NDIME<<" NNODE="<<NNODE<<" Nx="<<Nx<<" Ny="<<Ny<<endl;

   
//   READ TIME STEPPING AND SELECTIVE OUTPUT PARAMETERS


    inputfile>>Dtime>>Ttime;
    outputfile<<"Dtime="<<Dtime<<"  Ttime="<<Ttime<<endl;

    return;
}


void DataBankbyInput::InputBasicData(int** Lnods,double** Coord,double* InitialValue,double* dCbar)
{
    int ielem,inode,ipoin,idime,ithelm,ithpn,idCbar;

    ifstream input_data_file;
    string filename1;
    cout<<"Enter the name of the 3rd input file"<<endl;
    cin>>filename1;
    input_data_file.open(filename1.c_str());
    if(input_data_file.fail())
    {
        cout<<"The 3rd file input_data_file could not be opened"<<endl;
        exit(2);
    }

//
    ofstream output_data_file;
    string filename0;
    cout<<"Enter the name of the fourth output file"<<endl;
    cin>>filename0;
    output_data_file.open(filename0.c_str());
    if(output_data_file.fail())
    {
        cout<<"The fourth file output_data_file could not be opened"<<endl;
        exit(2);
    }

//   READ THE FIRST DATA CARD, AND ECHO IT IMMEDIATELY.

    for(ielem=0;ielem<NELEM;ielem++)
    {
        input_data_file>>ithelm;
        output_data_file<<ithelm;

        for(inode=0;inode<NNODE;inode++)
        {
            input_data_file>>Lnods[ielem][inode];
            output_data_file<<Lnods[ielem][inode]<<endl;
        }
    }

    for(ipoin=0;ipoin<NPOIN;ipoin++)
    {
        input_data_file>>ithpn;
        output_data_file<<ithpn;

        for(idime=0;idime<NDIME;idime++)
        {
            input_data_file>>Coord[ipoin][idime];
            output_data_file<<Coord[ipoin][idime]<<endl;
        }
    }

    for(ipoin=0;ipoin<NPOIN;ipoin++)
    {
        input_data_file>>ithpn>>InitialValue[ipoin];
        output_data_file<<ithpn<<"  "<<InitialValue[ipoin]<<endl;
    }

    for(ielem=0;ielem<NELEM;ielem++)
    {
        input_data_file>>idCbar>>dCbar[ielem];
cout<<"0"<<endl;   //这个可以输出！
cout<<idCbar<<"  "<<dCbar[ielem]<<endl;      //到这里就出错了！！！！
        output_data_file<<idCbar<<"  "<<dCbar[ielem]<<endl;

    }

    return;
}

问题已解决。