savings.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 "savings.h"
#include <iostream> 

using std::cout; 
using std::fixed;

#include <iomanip> 

using std::setprecision; 

// initialize static data member
double SavingsAccount::annualInterestRate = 0.0;

// calculate monthly interest on account
void SavingsAccount::calculateMonthlyInterest()
{  
   savingsBalance += savingsBalance *
                      ( annualInterestRate / 12.0 );

} // end function calculateMonthlyInterest

// change value of annual interest rate
void SavingsAccount::modifyInterestRate( double i )
{
   annualInterestRate = ( i >= 0 && i <= 1.0 ) ? i : 0.03;

} // end function modifyInterestRate

// print savings balance
void SavingsAccount::printBalance() const
{
   cout << fixed
        << '$' << setprecision( 2 ) << savingsBalance;

} // end function printBalance



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