datem.cpp

《c＋＋大学教程实验指导书》源码

// Chapter 6 of C++ How to Program
// datem.cpp
// member function definitions for date.cpp
#include <iostream>

using std::cout;

#include "date.h"

// constructor
Date::Date( int m, int d, int y ) 
{
   setDate( m, d, y );

} // end class Date constructor

// return day
int Date::getDay() 
{
   return day;

} // end function getDay

// return month
int Date::getMonth() 
{
   return month;

} // end function getMonth

// return year
int Date::getYear() 
{
   return year;

} // end function getYear

// set day
void Date::setDay( int d )
{
   if ( month == 2 && isLeapYear() )
      day = ( d <= 29 && d >= 1 ) ? d : 1;

   else
      day = ( d <= monthDays() && d >= 1 ) ? d : 1;

} // end function setDay

// set month
void Date::setMonth( int m ) 
{ 
   month = m <= 12 && m >= 1 ? m : 1;

} // end function setMonth

// set year
void Date::setYear( int y )
{
   year = y <= 2010 && y >= 1900 ? y : 1900;

} // end function setYear

// set date
void Date::setDate( int mo, int dy, int yr )
{
   setMonth( mo );
   setDay( dy );
   setYear( yr );

} // end function setDate

// output Date
void Date::print()
{ 
   cout << month << '-' << day << '-' << year << '\n';

} // end function print

/* Write function nextDay here */

// test whether is a leap year
bool Date::isLeapYear()
{
   if ( year % 400 == 0 || ( year % 4 == 0 && year % 100 != 0 ) )
      return true;

   else
      return false;    // not a leap year

} // end function isLeapYear

// return days in month
int Date::monthDays()
{
   const int days[ 12 ] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 
                            31, 30, 31 };

   return month == 2 && leapYear() ? 29 : days[ month - 1 ];

} // end function monthDays


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