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Write the function to overload the != operator for Planet. Assume that you are using each planet mass to check for equality.

Write the function to overload the != operator for Planet. Assume that you are using each planet mass to check for equality.

Database System Concepts
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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in c++

he following three questions refer to this code:

//Planet.h
//assume all includes and directives needed
class Planet
{
    friend bool operator>=(const Planet& p1, const Planet& p2);
    friend ostream& operator<<(ostream& os, const Planet& p);
    friend istream& operator>>(istream& is, Planet& p);
    
public:
    Planet();
    Planet(string name, double mass, double diameter);
    
private:
    string name;
    double mass;
    double diameter;
};
// Planet.cpp
Planet::Planet()
{
    this->name = "Unknown";
    this->mass = 0;
    this->diameter = 0;
}
 
Planet::Planet(string name, double mass, double diameter)
{
    this->name = name;
    this->mass = mass;
    this->diameter = diameter;
}
 
int SolarSystem::getNumberOfPlanets() const
{
    return (int)planets.size();
}
 
void SolarSystem::setNumberPlanets(int num)
{
    planets.resize(num);
    return;
}
 
bool operator>=(const Planet& p1, const Planet& p2)
{
    return p1.mass >= p2.mass;
}
 
istream& operator>>(istream& is, Planet& p)
{
    is >> p.name >> p.mass >> p.diameter;
    return is;
}
 
ostream& operator<<(ostream& os, const Planet& p)
{
    os << "The " << p.name << " planet - Mass: " << p.mass << " yettagrams, Diameter: " << p.diameter << " miles.";
    return os;
}
 
ostream& operator<<(ostream& os, SolarSystem& s)
{
    os << "\nYour Solar System contains " << s.getNumberOfPlanets() << " planets.\n";
    for(Planet& p: s.planets)
    {
        cout << p << endl;
    }
    return os;
}
// main.cpp
#include "Planet.h"
int main()
{
    //declarations
    SolarSystem the_system;
    int num_planets;
    
    //input and output
    cout << "How many planets are in your solar system? ";
    cin >> num_planets;
    
    //add planets
    the_system.setNumberPlanets(num_planets);
    
    //populate the solar system
    cin >> the_system;
 
    //print the solar system
    cout << the_system << endl;
    
    return 0;
} 
Write the function to overload the != operator for Planet. Assume that you are using each planet mass to check for equality.
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