salesp.cpp

经典的<<C how to program>一书第三版的例程。非常适合于C的初学者。

// Fig. 16.6: salesp.cpp
// Member functions for class SalesPerson
#include <iostream>

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

#include <iomanip>

using std::setprecision;
using std::setiosflags;
using std::ios;

#include "salesp.h"

// Constructor function initializes array
SalesPerson::SalesPerson()
{
   for ( int i = 0; i < 12; i++ )
      sales[ i ] = 0.0;
}

// Function to get 12 sales figures from the user 
// at the keyboard
void SalesPerson::getSalesFromUser()
{
   double salesFigure; 

   for ( int i = 1; i <= 12; i++ ) {
      cout << "Enter sales amount for month " << i << ": ";
      cin >> salesFigure;
      setSales( i, salesFigure );
   }
}

// Function to set one of the 12 monthly sales figures.
// Note that the month value must be from 0 to 11.
void SalesPerson::setSales( int month, double amount )
{
   if ( month >= 1 && month <= 12 && amount > 0 )
      sales[ month - 1 ] = amount; // adjust for subscripts 0-11
   else
      cout << "Invalid month or sales figure" << endl;   
}

// Print the total annual sales
void SalesPerson::printAnnualSales()
{
   cout << setprecision( 2 )
        << setiosflags( ios::fixed | ios::showpoint )
        << "\nThe total annual sales are: $"
        << totalAnnualSales() << endl;
}

// Private utility function to total annual sales
double SalesPerson::totalAnnualSales()
{
   double total = 0.0;

   for ( int i = 0; i < 12; i++ )
      total += sales[ i ];

   return total;
}


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