taxfile.cpp

适合初学者学习以及程序员回顾

// TaxFile.cpp

#include <iomanip>
#include <iostream>
using std::cin;
using std::cout;
using std::endl;
using std::setw;

#include <fstream>
using std::ifstream;
using std::ofstream;

// ---函数 CalculateTax() 的宣告----
float CalculateTax(float);

// ---主程式------------------------
int main()
{
   char* FileNameIn  = "Income.txt";
   char* FileNameOut = "Tax.txt";
   float Income, Tax;

   ifstream FileInput;
   ofstream FileOutput;
   FileInput.open( FileNameIn );
   FileOutput.open( FileNameOut );

   if (!FileInput)
     {cout << "档案: " << FileNameIn
      << " 开启失败!"  << endl; exit(1);}

   if (!FileOutput)
     {cout << "档案: " << FileNameOut
      << " 存档失败!"  << endl; exit(1);}

   FileInput >> Income;
   Tax = CalculateTax(Income);

   cout << "您要缴的综合所得税是: "
        << Tax << " 元";

   FileOutput << "您要缴的综合所得税是: "
        << Tax << " 元";

   FileInput.close();
   FileOutput.close();
   return 0;
}

// ---函数 CalculateTax() 的定义-----
float CalculateTax(float GIncome)
{
  float Tax;
  if (GIncome < 0.0)
    cout << "您输入的综合所得净额没有意义!\n";
  else if (GIncome <  330000.0)
        Tax = GIncome * 0.06;
  else if (GIncome <  890000.0)
  	Tax = GIncome * 0.13 - 23100;
  else if (GIncome < 1780000.0)
  	Tax = GIncome * 0.21 - 94300;
  else if (GIncome < 3340000.0)
  	Tax = GIncome * 0.3 - 254500;
  else
  	Tax = GIncome * 0.4 - 588500;
  return Tax;
}