行数始终为0

Question

为什么行数总是0？它应该是10，但输出总是0.这个方法有什么问题吗？

int main() {
    vector<double> doubleCoefficient; // vector to store unknown number of equations (double)

    /* Read from file and assign values to vector */

    //File stream object
    ifstream inputFile;
    //Open the txt file
    inputFile.open("test.txt");

    //search for the text file
    if(!inputFile.is_open())
    {
        cerr << "Error opening file \n";
        exit(EXIT_FAILURE);
    }
    else
    {
        cout << "File found and successfully opened. \n";
    }
    double x;

    while(!inputFile.eof()){

        inputFile >> x;
        doubleCoefficient.push_back(x);
    }

    int count =0;
    string line;
    while (getline(inputFile, line)){
        count++;
    }
    cout << "Number of lines in text file:" << count << endl;

    inputFile.close();
}

Answer 1

使用while(!inputFile.eof())您将转到文件的末尾，因此，您无法读取行。 您需要使用fseek()

返回到开头

尝试

fseek ( inputFile , 0 , SEEK_SET );

在计算线之前。