need a little help

ap6118 · #1 28-Feb-2005, 08:55

here's a template for a class definition of a program,what i need is a way to do error checking on the initializer values for data members month,day and year.

CPP / C++ / C Code:

#ifndef DATE_H
#define DATE_H

// class Date definition
class Date {

public:
   Date( int = 1, int = 1, int = 1900 ); // default constructor
   void print();

   void setDate( int, int, int );

   void setMonth( int );
   int getMonth();

   void setDay( int );
   int getDay();

   void setYear( int );
   int getYear();

   bool isLeapYear();
   int monthDays();
   void nextDay();
   /* Write prototype for nextDay */

private:
   int month;
   int day;
   int year;

}; // end class Date

#endif // DATE_H

thanks a bunch guys.

ap6118 · #2 28-Feb-2005, 09:22

sorry guys.thought it was going to be desperate,but i was mistaken.got it done and all.here is the entire program in case somebody needs it.the code sets a date and increments days by one with account to date changes.
this program can be found in the lab accompanion book,of c++ how o program 4th edition,since it's the book i'm working with.

CPP / C++ / C Code:

// date.h
#ifndef DATE_H
#define DATE_H

// class Date definition
class Date {

public:
   Date( int = 1, int = 1, int = 1900 ); // default constructor
   void print();

   void setDate( int, int, int );

   void setMonth( int );
   int getMonth();

   void setDay( int );
   int getDay();

   void setYear( int );
   int getYear();

   bool isLeapYear();
   int monthDays();
   void nextDay();
   /* Write prototype for nextDay */
   void fixit();

private:
   int month;
   int day;
   int year;

}; // end class Date

#endif // DATE_H

CPP / C++ / C Code:

// 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 */
void Date::nextDay()
{
	
	day++;	
	
}

// 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 && isLeapYear() ? 29 : days[ month - 1 ];

} // end function monthDays
void Date::fixit()
{
	if ( day >30)
	{
		day = 1;
		month++;
	}
	if (month > 12)
	{
		month = 1;
		year++;
	}
}

CPP / C++ / C Code:

// date.cpp
#include <iostream>

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

#include "date.h"

int main()
{
   const int MAXDAYS = 160;
   Date d( 10, 2, 2002 );

   // test print and nextDay
   for ( int loop = 1; loop <= MAXDAYS; ++loop ) {
	  d.print();
	 d.nextDay();
	 d.fixit();
      /* Write call to nextDay */

   } // end for

   cout << endl;

   return 0;

} // end main

taddaaaa.
have a nice day everybody.

davekw7x · #3 28-Feb-2005, 11:01

Quote:

Originally Posted by ap6118

the code sets a date and increments days by one with account to date changes.

A good effort.

However...

In testing this I see a couple of issues:

1. Did you notice that all months have 30 days? (Look at fixit())

2. In the constructor, you call setMo(), then setDay(), then setYear(). However , I see that setDay() calls isLeapYear(), which needs to know the year. (So call setYear() must be called before setDay())
Try initializing February 29 in a leap year, such as 2004, then a non-leap year, such as 2005 to see the result.

You have certainly learned how to put a program together in C++. A few details that can be easily fixed, and you are ready for Bigger and Better things. Keep up the good work!

Regards,

Dave

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need a little help

nevermind got it..lol