// This program repeatedly reads an income from
// the file income.in until end-of file. Income
// under 6000 greenbacks is taxed at 30 percent, 
// and income greater than or equal to 6000 
// greenbacks is taxed at 60 percent. After 
// reading each income, the program prints the 
// income and tax.
#include <fstream>
using namespace std;
const int cutoff = 6000;
const float rate1 = 0.3;
const float rate2 = 0.6;
int main() {
   ifstream infile;
   ofstream outfile;
   int income, tax;
   infile.open( "income.in" );
   outfile.open( "tax.out" );
   while ( infile >> income ) {
      if ( income < cutoff )
         tax = rate1 * income;
      else
         tax = rate2 * income;
      outfile << "Income = " << income 
              << " greenbacks\n"
              << "Tax = " << tax
              << " greenbacks\n";
   }
   infile.close();
   outfile.close();
   return 0;
}