pc3_9.cpp

《c＋＋大学教程实验指导书》源码

// Chapter 3 of C++ How to Program
// Programming Challenge 9 (Solution)

#include <iostream> 

using std::cout; 
using std::endl; 
using std::cin; 
using std::fixed;

#include <iomanip>
 
using std::setw; 
using std::setprecision; 

#include <cmath>

double calculateCharges( double );

int main()
{
   double hour; // hours parked for each car
   double currentCharge; // current parking charge
   double totalCharges = 0.0; // total charges   
   double totalHours = 0.0; // total hours

   cout << "Enter the hours parked for three cars: ";

   for ( int i = 1; i <= 3; i++ ) {
      cin >> hour;
      totalHours += hour;
   
      if ( i == 1 ) {
         cout << setw( 5 ) << "Car" << setw( 15 ) << "Hours"
              << setw( 15 ) << "Charge\n";

      } // end if
   
      totalCharges += ( currentCharge = 
         calculateCharges( hour ) );

      cout << fixed << setw( 3 ) << i << setw( 17 )
           << setprecision( 1 ) << hour
           << setw( 15 ) << setprecision( 2 )
           << currentCharge << "\n";
   
   } // end for

   cout << setw( 7 ) << "TOTAL" << setw( 13 ) << setprecision( 1 )
        << totalHours << setw( 15 ) << setprecision( 2 )
        << totalCharges << endl;

   return 0;

} // end main

// calculate charges for hours parked
double calculateCharges( double hours )
{
   double charge;

   if ( hours < 3.0 )
      charge = 2.0;
   else if ( hours < 19.0 )
      charge = 2.0 + .5 * ceil( hours - 3.0 );
   else
      charge = 10.0;
   
   return charge;

} // end function calculateCharges

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