pc7_12.cpp

《c＋＋大学教程实验指导书》源码

// Chapter 7 of C++ How to Program
// Programming Challenge 12 (Solution)

#include <iostream> 

using std::cout;
using std::endl;

#include <iomanip> 

using std::setw; 

#include "savings.h"

int main()
{
   SavingsAccount saver1( 2000.0 );
   SavingsAccount saver2( 3000.0 );

   SavingsAccount::modifyInterestRate( .03 );

   cout << "\nOutput monthly balances for one year at .03" 
        << "\nBalances: Saver 1 ";
   saver1.printBalance();

   cout << "\tSaver 2 ";
   saver2.printBalance();

   for ( int month = 1; month <= 12; ++month ) {
      saver1.calculateMonthlyInterest();
      saver2.calculateMonthlyInterest();

      cout << "\nMonth" << setw( 3 ) << month << ": Saver 1 ";
      saver1.printBalance();

      cout << "\tSaver 2 ";
      saver2.printBalance();

   } // end for

   SavingsAccount::modifyInterestRate( .04 );

   saver1.calculateMonthlyInterest();
   saver2.calculateMonthlyInterest();

   cout << "\nAfter setting interest rate to .04" 
        << "\nBalances: Saver 1 ";
   saver1.printBalance();

   cout << "\tSaver 2 ";
   saver2.printBalance();
   cout << endl;

   return 0;

} // end main


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