salesp.cpp

来自「经典vc教程的例子程序」· C++ 代码 · 共 56 行

// Fig. 6.7: salesp.cpp
// Member functions for class SalesPerson
#include <iostream.h>
#include <iomanip.h>
#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 = 0; i < 12; i++ ) {
      cout << "Enter sales amount for month "
           << i + 1 << ": ";
      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 >= 0 && month < 12 && amount > 0 )
      sales[ month ] = amount;
   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;
}