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
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:
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//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;
};
|
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// 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;
}
|
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// 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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