Answered: C++. Please do not change the existing…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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C++. Please do not change the existing code. The instructions are in the image that is provided. Please zoom in or you can download the png file. Thank you!

Time.cpp

#include "Time.h"

//Default Constructor

//Constructor with parameters

int Time::getHour() const { return hour; }
int Time::getMinute() const { return minute; }
int Time::getSecond() const { return second; }
void Time::setHour(int h) { hour = h; }
void Time::setMinute(int m) { minute = m; }
void Time::setSecond(int s) { second = s; }

int Time::timeToSeconds() const
{
return (getSecond() + getMinute() * 60 + getHour() * 3600);
}

const Time Time::secondsToTime(int s) const
{
    int resultS = s % 60;
    s /= 60;
    int resultM = s % 60;
    s /= 60;
    int resultH = s % 24;
    return Time(resultH, resultM, resultS);
}

//toString

// +

// -

// <

// >

// ==

------

Time.h

#ifndef TIME
#define TIME

#include <string>

using namespace std;

class Time
{
private:
    int hour;
    int minute;
    int second;
    int timeToSeconds() const;
    const Time secondsToTime(int s) const;

public:
    Time();
    Time(int h, int m, int s);
    string toString() const;
    int getHour() const;
    void setHour(int h);
    int getMinute() const;
    void setMinute(int m);
    int getSecond() const;
    void setSecond(int s);
    const Time operator+(const Time &other) const;
    const Time operator-(const Time &other) const;
    bool operator<(const Time &other) const;
    bool operator>(const Time &other) const;
    bool operator==(const Time &other) const;
};

#endif

------

Date.cpp

#include "Date.h"

//Default Constructor

//Constructor with parameters

int Date::getDay() const { return day; }
int Date::getMonth() const { return month; }
int Date::getYear() const { return year; }
void Date::setDay(int h) { day = h; }
void Date::setMonth(int m) { month = m; }
void Date::setYear(int s) { year = s; }

//dateToDays

//daysToDate

//toString

// +

// -

// <

// >

// ==

------

Date.h

#ifndef DATE
#define DATE

#include <string>

using namespace std;

class Date
{
private:
    int day;
    int month;
    int year;
    int dateToDays() const;
    const Date daysToDate(int ndays) const;

public:
    Date();
    Date(int d, int m, int y);
    string toString() const;
    int getDay() const;
    void setDay(int d);
    int getMonth() const;
    void setMonth(int m);
    int getYear() const;
    void setYear(int y);
    const Date operator+(int ndays) const;
    const Date operator-(int ndays) const;
    bool operator<(const Date &other) const;
    bool operator>(const Date &other) const;
    bool operator==(const Date &other) const;
};

#endif

------

Event.cpp

------

Event.h

------

main.cpp

#include <iostream>
#include "Time.h"
#include "Date.h"
#include "Event.h"
using namespace std;

int main() {
return 0;
}

Certainly! Below is an educational transcription of the image:

---

# Event Planning System: Classes Overview

In this project, you will create three classes for an event planning system: Time, Date, and Event. These classes will define how to describe when events occur and allow you to compare different times and dates.

## Time

### Purpose
The `Time` class manages a 24-hour cycle clock time. It covers the beginning of the day at 0:0:0 (Hour:Minute:Second) and ends at 23:59:59.

### Data Members
- `int sec`
- `int min`
- `int hour`

### Functions

#### Default Constructor
Initializes the time to a default value of 0:0:0.

#### Constructor
Accepts three integers representing hours, minutes, and seconds. If invalid values are provided (e.g., 63 minutes or -1 hours), the time is initialized to zero. Note that adjusting invalid input such as this is typically a topic addressed later in the semester.

Accepted ranges:
- Seconds: 0 to < 59
- Minutes: 0 to < 59
- Hours: 0 to < 23

#### Getters and Setters
Methods for accessing and modifying member variables. The getter method must be constant with its parameter as a constant reference.

#### toString
Returns a string describing the time in the format `hour:minute:second`.

*Example*

```cpp
Time time = Time(17, 59, 1);
cout << time.toString() << endl;
```

Outputs: `17:59:01`

#### TimeToSeconds
Private helper function that converts time into total seconds as an integer, used by comparison operators.

#### SecondsToTime
Private helper that converts an integer (seconds) to a Time object.

#### Operators
- **+ and -**: Support addition/subtraction of `Time` objects. If seconds exceed 59, convert to minutes.

Example:
```cpp
const Time operator+(const Time& other) const;
const Time operator-(const Time& other) const;
```

- **< and >**: Supports comparisons, noting 0:0:0 as the smallest and 23:59:59 the largest.

Example:
```cpp
bool operator<(const Time& other) const;
bool operator>(const Time& other) const;

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