c++ - 从文件中读取行并将它们放入变量中时遇到问题 (C++)

Question

我正在用 C++ 为学校编写一个程序，它正在运行，但我在这个特定领域遇到了麻烦。

我需要从另一个函数的循环中调用一个函数。我需要读取 5 行并将读取的每个数字集合放入一个 double 值中。现在我只是想确保我可以正确阅读文件。目前，每当我运行该程序时，它都会经历循环并打印信息五次，但它似乎只打印最后一行的数字五次。

我的代码中有什么使得我的程序只适用于输入文件的最后一行？

这是我的信息:

需要读取的输入文件:

1121  15.12  40                                                                                     

9876   9.50  47

3333  22.00  35

2121   5.45  43

9999  10.00  25

Code that I'm working with:

 double process_employee(double& employeeNumber, double& employeeRate, double& employeeHours)

 {

     ifstream employeeInputFile;

     employeeInputFile.open("employee input file.txt");

     if(employeeInputFile.fail())
     {
         cout << "Sorry, file could not be opened..." << endl;

        system("pause");
         exit(1);
     }

     //For some reason, this is only printing the data from the last line of my file 5 times
     while (!employeeInputFile.eof())  
     {
         employeeInputFile >> employeeNumber >> employeeRate >> employeeHours;
     }

}

void process_payroll()
{   
     double employeeNumber = 1.0;
     double employeeRate = 1.0;
     double employeeHours = 1.0;

     cout << "Employee Payroll" << endl << endl;
     cout << "Employee  Hours   Rate    Gross   Net Fed State   Soc Sec" 
          << endl;

     //caling process_employee 5 times because there are 5 lines in my input file
     for(int i = 1; i <= 5; i++)
     {
         process_employee(employeeNumber, employeeRate, employeeHours);

         cout << "Employee #: " << employeeNumber << " Rate: " << employeeRate << " Hours: " 
         << employeeHours << endl;
     }
}

Answer 1

你不断地覆盖你的变量:

while (!employeeInputFile.eof())  
{
   employeeInputFile >> employeeNumber >> employeeRate >> employeeHours;
}

您需要将它们保存在中间，例如:

std::vector<EmployeeStructure> someVector;

while (!employeeInputFile.eof())  
{
   employeeInputFile >> employeeNumber >> employeeRate >> employeeHours;
   someVector.push_back(EmpoyeeStructure(employeeNumber, employeeRate, employeeHours));
}

然后，传递该 Vector 并打印信息。