c++ - int main()/函数的问题

Question

嗨，我的作业将在几个小时后到期，我正在尝试编写我的代码来生成此输出，但它不起作用。我的程序甚至根本不运行，总是失败，我不知道问题出在哪里。我对在 int main() 中放置什么以及如何处理从文件到函数的数据有疑问!我一直在努力..需要主要帮助!!!!!谢谢你的时间

示例输入文件:

Miss Informed
125432  32560.0
Sweet Tooth
5432  9500
Bad Data
1255  -4500.0
John Smith
1225  3500.0
Nancy Brown
1555  154500.0

代码:

#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>

using namespace std;



    int main()
    {
        float CalcIncomeTax(float );
        float CalcNetSalary(float, float );
        bool OpenFile(ifstream& fin);
        bool OpenFile(ofstream& fout);
        void Instruct(void);
        void ReadData(ifstream & fin, string& Name , int &Id, float& grossIncome);
        void Print(ofstream&, string, int, float, float, float);

        ifstream    fin;
        ofstream    fout;
        string      Name;
        int         Id = 0;
        float       grossIncome = 0;
        float       netSalary;
        float       incomeTax = 0;


       Instruct ();


            netSalary = CalcNetSalary(grossIncome,incomeTax);
            incomeTax = CalcIncomeTax(grossIncome);
            Print(fout, Name, Id, grossIncome, incomeTax, netSalary);
            ReadData(fin, Name, Id, grossIncome);

        OpenFile(fin);
        {
            getline(fin, Name);
            while (!fin.eof())
            {
                fin >> Id >> grossIncome;
                cout << setw(20) << left  << Name
                << setw(8)  << right << Id
                << setw(10) << grossIncome  << endl;
                fin.ignore(10,'\n');
                fin >> Id >> grossIncome;
            }
            getline(fin,Name);
        }

        OpenFile(fout);

        ReadData(fin, Name, Id, grossIncome);


        fin.close();
    }


            bool OpenFile(ifstream&fin)
    {
        cout <<"\nEnter the name and location of the input file:   ";
        string file_input;
        getline(cin, file_input);
        fin.open(file_input.c_str() ) ;
        if(fin.fail())
            return false;
        else
            return true;
    }
            bool OpenFile(ofstream &fout)
    {
        cout <<"Enter the name and location of the output file:   ";
        string file_output;
        getline(cin, file_output);
        fout.open( file_output.c_str() );
        if (fout.fail())
        return false;
        else
        return true;
    }


        void Instruct()
    {
        cout << "Programmer:"<< setw(25) << "//" << endl;
        cout << "Programming Assignment" << setw(5) << "4" << endl;
        cout << "This program will calculate and report tax liability" << endl;
    }

        float CalcIncomeTax(float grossIncome)
    {
        float incomeTax = 0;

        if (grossIncome <= 3500)
        {
            incomeTax = 0.00;
        }
        else if (grossIncome >= 3500 && grossIncome <= 8000)
        {
            incomeTax = 0 + 0.06 * (grossIncome - 3500);
        }
        else if (grossIncome >= 8000 && grossIncome <= 20000)
        {
            incomeTax = 270.00 + 0.11 * (grossIncome - 8000);
        }
        else if (grossIncome >= 20000 && grossIncome <= 34000)
        {
            incomeTax = 1590.00 + 0.17 * (grossIncome - 20000);
        }
        else if (grossIncome >= 34000 && grossIncome <= 54000)
        {
            incomeTax = 3970.00 + 0.24 * ( grossIncome - 34000);
        }
        else if (grossIncome >= 54000)
        {
            incomeTax = 8770.00 + 0.32 * ( grossIncome - 52000);
        }
        else if (grossIncome < 0)
        {
            cout << "****Invalid Income";
        }
        return(incomeTax);
    }


        float CalcNetSalary( float grossIncome, float incomeTax)
    {
        float netSalary;
        netSalary = grossIncome - incomeTax;
        return (netSalary);
    }

        void Print(ofstream& fout, string Name, int Id, float grossIncome, float incomeTax, float netSalary)
    {
        cout << setfill(' ') << left << setw(18) << "\tName";
        cout << setfill(' ') << left << setw(12) << "ID";
        cout << setfill(' ') << left << setw(17) << "Gross Income";
        cout << setfill(' ') << left << setw(12) << "Taxes";
        cout << setfill(' ') << left << setw(16) << "Net Income";
        cout << endl;

        cout << setfill('=') << setw(70)<<"\t";
        cout<<endl;

        cout << setprecision(2) << showpoint << fixed;
        cout << setfill(' ') << "\t" << setw(17)<< Name;
        cout << setfill(' ') << setw(12) << Id;
        cout << '$' << setfill(' ') << setw(16) << grossIncome;
        cout << '$' << setfill(' ') << setw(11) << incomeTax;
        cout << '$' << setfill(' ') << setw(16) << netSalary;
        cout << endl;
    }

应该如何输出

Name             ID           Gross Income        Taxes         Net Income 
Miss Informed    125432        $32560.00     **** Invalid ID
Sweet Tooth      5432          $9500.00          $435.00         $9065.00
Bad Data         1255          $-4500.00     **** Invalid Income
John Smith       1225          $3500.00          $0.00           $3500.00
Nancy Brown      1555          $154500.00        $40930.00       $113570.00

Answer 1

编写程序的方法是不是编写所有内容然后尝试运行它。 从小而简单开始，一次增加一点复杂性，在每一步都进行测试，永远不要添加不起作用的代码。

这将需要几次迭代。我们将从可以从文件中读取的内容开始:

#include <iostream>
#include <fstream>
#include <string>

using namespace std; // This is a good TEMPORARY SHORTCUT.

int main()
{
  ifstream fin("inputdata");

  string firstName, lastName;

  fin >> firstName >> lastName;

  cout << "First name is " << firstName << endl;
  cout << "Last name is " << lastName << endl;

  return(0);
}

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