fundraiser.cpp

C++大学简明教程,解压就行没有密码。希望对大家有用

// Tutorial 11: Fundraiser.cpp
// Calculates the amount of a donation after expenses and then
// totals repeated donations.
#include <iostream> // required to perform C++ stream I/O
#include <iomanip>  // required for parameterized stream manipulators

using namespace std; // for accessing C++ Standard Library members

// global variable stores total raised for charity
double totalNetDonations = 0.00;

double calculateDonation( int ); // function prototype

// function main begins program execution
int main()
{
   int grossDonation; // stores the gross donation

   // prompt user for and input donation amount
   cout << "\nEnter donation amount (0 or less to exit): ";
   cin >> grossDonation; // get gross donation

   // specify display format
   cout << fixed << setprecision( 2 );

   while ( grossDonation > 0 )
   {
      // obtain donation amount after operating expenses deduction
      double netDonation = calculateDonation( grossDonation );

      // display amount of donation after expenses
      cout << "After expenses:\t$" << netDonation << endl;

      // update total amount of donations received
      totalNetDonations += netDonation;

      // display total amount collected for charity
      cout << "Total raised:\t$" << totalNetDonations << endl;

      // prompt user for and input next donation amount
      cout << "\nEnter donation amount (0 or less to exit): ";
      cin >> grossDonation; // get gross donation
   } // end while

   cout << "\n"; // insert newline for readability
   return 0; // indicate that program ended successfully

} // end function main

// returns donation amount after operating expenses
double calculateDonation( int donatedAmount )
{
   const double NET_PERCENTAGE = 0.83;

   // calculate amount of donation for charity
   return NET_PERCENTAGE * donatedAmount;

} // end function calculateDonation

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