Question

Question 1：Write a program that randomly generates 100 dates and store them into a vector. Use the Date class provided . The dates generated must be within 1000 days after 1/1/2000.
Question 2：Sort the 100 dates generated in Question 1 in ascending order.

This is Class data.h.(Please don't change the data.h file)

data.h

#ifndef DATE_H_
#define DATE_H_

#include
#include

using namespace std;

class Date {
   friend ostream &operator<<( ostream &, const Date & );
private:
   int day;
   int month;
   int year;
static const int days[]; // array of days per month
void helpIncrement(); // utility function for incrementing date

public:
   Date(int=1, int=1, int=0);
   void setDate(int,int,int);
   bool leapYear( int ) const; // is date in a leap year?
bool endOfMonth( int ) const; // is date at the end of month?
Date &operator++(); // prefix increment operator
Date operator++( int ); // postfix increment operator
const Date &operator+=( int ); // add days, modify object
bool operator<(const Date&) const;

   void showdate();
};

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

Date::Date(int d, int m, int y) {
day = d;
month = m;
year = y;
// initialize static member at file scope; one classwide copy
}

// set month, day and year
void Date::setDate( int dd, int mm, int yy )
{
year = yy;
month = ( mm >= 1 && mm <= 12 )? mm : 1;

// test for a leap year
if ( month == 2 && leapYear( year ) )
day = ( dd >= 1 && dd <= 29 ) ? dd : 1;
else
day = ( dd >= 1 && dd <= days[ month ] ) ? dd : 1;
} // end function setDate

// if the year is a leap year, return true; otherwise, return false
bool Date::leapYear( int testYear ) const
{
if ( testYear % 400 == 0 ||
( testYear % 100 != 0 && testYear % 4 == 0 ) )
return true; // a leap year
else
return false; // not a leap year
} // end function leapYear

// determine whether the day is the last day of the month
bool Date::endOfMonth( int testDay ) const
{
if ( month == 2 && leapYear( year ) )
return testDay == 29; // last day of Feb. in leap year
else
return testDay == days[ month ];
} // end function endOfMonth

// function to help increment the date
void Date::helpIncrement()
{
// day is not end of month
if ( !endOfMonth( day ) )
day++; // increment day
else
if ( month < 12 ) // day is end of month and month < 12
{
month++; // increment month
day = 1; // first day of new month
} // end if
else // last day of year
{
year++; // increment year
month = 1; // first month of new year
day = 1; // first day of new month
} // end else
} // end function helpIncrement

// overloaded prefix increment operator
Date &Date::operator++()
{
helpIncrement(); // increment date
return *this; // reference return to create an lvalue
} // end function operator++

// overloaded postfix increment operator; note that the
// dummy integer parameter does not have a parameter name
Date Date::operator++( int )
{
Date temp = *this; // hold current state of object
helpIncrement();

// return unincremented, saved, temporary object
return temp; // value return; not a reference return
} // end function operator++

// add specified number of days to date
const Date &Date::operator+=( int additionalDays )
{
for ( int i = 0; i < additionalDays; i++ )
helpIncrement();

return *this; // enables cascading
} // end function operator+=

// overloaded output operator
ostream &operator<<( ostream &output, const Date &d )
{
// static string monthName[ 13 ] = { "", "January", "February",
// "March", "April", "May", "June", "July", "August",
// "September", "October", "November", "December" };
//
// output << d.day << " " << monthName[ d.month ] << " "<< d.year;
   output << setfill('0')
           << setw(2) << d.day << '/'
           << setw(2) << d.month << '/'
           << setw(4) << d.year;

   return output; // enables cascading
} // end function operator<<

bool Date::operator<(const Date& right) const {
   return (year < right.year || (year == right.year && month < right.month) ||
           (year == right.year && month == right.month && day < right.day));
}

void Date::showdate()
{
cout << "The date is ";
cout << setfill('0')
       << setw(2) << day << '/'
       << setw(2) << month << '/'
       << setw(2) << year % 100
       << endl;
return;
}

#endif /* DATE_H_ */

Answer 1

Answer :

question 1 :

The required code :

#include <iostream>
#include <sstream>
#include <vector>
#include <cstdlib>

using namespace std;

class Date {
private:
int m, d, y;
public:
static bool isLeapYear(int y) {
return (y % 400 == 0) || ((y % 4 == 0) && (y % 100 != 0));
}
static bool isValid(int m, int d, int y) {
if(m < 1 || m > 12 || d < 1 || d > 31) {
return false;
}
if((m == 6 || m == 11 || m == 4 || m == 9) && (d > 30)) {
return false;
}
if(isLeapYear(y) && m == 2 && d > 29) {
return false;
}
if(!isLeapYear(y) && m == 2 && d > 28) {
return false;
}
if(y < 1753 || y > 9999) {
return false;
}
return true;
}
Date(int m, int d, int y) {
this->m = m;
this->d = d;
this->y = y;
}

void increaseDate(int days) {
while(days != 0) {
d++;
if(!isValid(m, d, y)) {
m++;
d = 1;
if(!isValid(m, d, y)) {
y++;
m = 1;
}
}
days--;
}
}

string printDate() {
stringstream ss;
ss << m << "/" << d << "/" << y;
return ss.str();
}
};

vector<string> getRandomDates(int count) {
  
vector<string> result;

for(int i=0; i<count; i++) {
Date d(11, 12, 1996);
d.increaseDate(rand() % 1000);
result.push_back(d.printDate());
}

return result;
}

int main() {
vector<string> dates = getRandomDates(100);

for(string s: dates) {
cout << s << endl;
}
}

Result :

========================================================================================

ANSWERED AS PER MY KNOWLEDGE

IF ANY DOUBTS COMMENTS IT