Computer Science Canada

Relational operator overloading
Author:  Imajica [ Sun Mar 21, 2004 7:46 am ]
Post subject:  Relational operator overloading
All of my overloaded relational operators return a "false" when tested w/ the instructors driver. My code appears to be valid. I have no idea what is causing this.

#ifndef DATE_H
#define DATE_H
#include<iostream>
using std::ostream;
using std::istream;

class Date {
friend ostream &operator<<(ostream &, const Date &);
friend istream &operator>>(istream &, Date &);

public:
Date(int m = 1, int d = 1, int y = 1);
Date(const Date &);

void setMonth(int);
void setDay(int);
void setDate(int, int, int );
void setYear(int);
const int getMonth()const{return month;}
const int getDay()const{return day;}
const int getYear()const{return year;}
int operator<(Date &);
bool leapYear(int)const;
void printText()const;

private:
int month, day, year;
static const int days[];
bool lastDay(int);
void increment();
void decrement();
};

#endif

#include<iostream>
#include"date.h"
using std::endl;
using std::cout;

const int Date::days[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

Date::Date( int m, int d, int y )
{
setDay( d );
setMonth( m );
setDate( m, d, y );
}

Date::Date( const Date &d )
{
month = d.month, day = d.day, year = d.year;
setDate( month, day, year );
}

void Date::setMonth( int m )
{
month = m;
}

void Date::setDay( int d )
{
day = d ;
}

void Date::setYear( int y )
{
year = y ;
}

void Date::setDate( int m, int d, int y )
{
if( m < 1 || m > 12 )
{
cout<<"Invalid date has been reset\n";
}

month = ( m >= 1 && m <= 12 ) ? m : 1;

year = ( y >= 1 && y <= 9999 ) ? y : 2004;

if ( day = ( d < 1 || d > days[ month ] ))
{
cout <<"Invalid date has been reset\n\n";
}
if ( month == 2 && leapYear( year ))
day = ( d >= 1 && d <= 29 ) ? d : 1;
else
day = ( d >= 1 && d <= days[ month ] ) ? d : 1;
}

bool Date::leapYear( int y )const
{
if (( y % 4 == 0 && y % 100 != 0 ) || y % 400 == 0 )
return true;
else
return false;
}

bool Date::lastDay( int d )
{
if ( month == 2 && leapYear( year ))
return d == 29;
else
return d == days[ month ];
}

int Date::operator<( Date & d )
{
if ( this->year == d.year )
{
if ( this->month == d.month )
{
if( this ->day < d.day )
{
cout <<"here " << day;
}
return this->day < d.day;
}
else
{
return this->month < d.month;
}
}
return this->year < d.year;
}

ostream &operator<<( ostream &output, const Date &d )
{
static char *month[ 13 ] = { "", "January",
"February", "March", "April", "May", "June",
"July", "August", "September", "October",
"November", "December" };

output << month[ d.month ] << ' '
<< d.day << ", " << d.year;

return output;
}

istream &operator>>( istream &input, Date &d )
{
int mo, dy, yr;
char c;

input >> mo >> c >> dy >> c >> yr ;

d.setDate(mo, dy, yr);

return input;
}


#include"Date.h"
#include<iostream>
using std::cout;
using std::cin;
#include<cstring>

void relational();

Date date1, date2, result;

int main()
{
relational();

return 0;
}

void relational()
{
char yn[100], op[4], answer[6];
do
{
cout << "Enter the < symbol with 2 dates in the form dd/mm/yyyy < dd/mm/yyyy\n";
cin >> date1 >> op >> date2;

if ( strcmp( op, "<" ) == 0 )
strcpy( answer, (date1 < date2, "true", "false") );
else
{
cout << "Invalid operator. Valid relational "
<< "operators are <n";
strcpy( answer, "bogus" );
}

cout << date1 <<" "<< op <<" "<< date2
<<" = "<< answer << "\n";

cout << "\nWould you like to see the invalid response again? ";
cin >> yn;
} while ( yn[0] == 'y' || yn[0] == 'Y' );
}

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