Planet

#include <iostream>
#include <vector>
#include <cmath>
#include <cstdlib>
#include <string>
#include <cctype>

using namespace std;

const double PI = 3.141;
const double Grav =6.67; //Newtonian gravitional constant

class Planet
{
    public:
        Planet();
        int menu();
        double calculateArea(int);
        double calculateVolume(int);
        double calculateDensity(int);
        double calculategravity(int);
        double getCalcuVol();
        double getMass();
        void setMass(double);
        double getRadius();
        void setRadius(double);
        void AddPlanet();
        void sortPlanets();
        void Remove(string n);
        void FindPlanets(string n);
        void DisplayPlanet() const;
        string GetName();
        void setName(string n);

    private:
        double mass;
        double volume;
        double Radius;
        string Name;

};

vector <Planet> planet(0);

Planet::Planet()
{
    mass = 0.0;
    Radius = 0.0;
    string Name;
}

string Planet::GetName()
{
    string::iterator it(Name.begin()); //iterator
    if (it != Name.end())
                Name[0] = toupper((unsigned char)Name[0]); //Change all first letter to capital letter.

        while(++it != Name.end())
        {
                *it = tolower((unsigned char)*it); //Leave everything behind lower case after first letter
        }
        return Name; //return value on variable name.
}


void Planet::setName(string n)
{
    Name=n;
}

double Planet::getMass()
{
    return mass;
}

void Planet::setMass(double m)
{
    mass=m;
}

double Planet::getRadius()
{
    return Radius;
}

void Planet::setRadius(double R)
{
    Radius=R;
}

double Planet::calculateArea(int A) //Calculating the Area
{
    Planet s;
    return (4*PI*pow(Radius, 2));
}


double Planet::calculateDensity(int D) //Volume function is already in the Denstiy formula.
{
    Planet s;
    return mass/((4*PI*pow(Radius, 3))/3);
}

double Planet::calculategravity(int G) //Calculating the Gravity due to the accerlation of the planet.
{
    Planet s;
    return ((Grav*pow(10, -11))*mass)/(pow(Radius, 2));

}

void Planet::AddPlanet() //Adding planet.
{
    Planet s;

    cout << "Name of the planet: ";
    cin >> Name;

    cout << "Enter mass(Kilograms): "<<endl;
    cin >> mass;

    while((mass < 0) || (cin.fail() !=0))
    {
        if(cin.fail() !=0)
        {
            cout << "Error! Can't read it! \n" << endl << "Please type your mass again: "<<endl;
            cin.clear();
            cin.ignore(256,'\n');
        }
        else if(mass < 0)
        {
            cout << "Type value of postive" << endl; // between 1~4
        }
        cin >> mass;
    }

    cout << "Enter Radius(meters): ";
    cin >> Radius;
    while((Radius < 0) || (cin.fail() !=0))
    {
        if(cin.fail() !=0)
        {
            cout << "Error! Can't read it! \n" << endl << "Please type it again.";
            cin.clear();
            cin.ignore(256,'\n');
        }
        else if(Radius < 0)
        {
            cout << "Type value of postive" << endl; // between 1~4
        }
        cin >> Radius;
    }

    s.setMass(mass);
    s.setRadius(Radius);
    s.setName(Name);
    planet.push_back(s);
}


void Planet::sortPlanets() //Sorting planet
{
    Planet temp;
    for (int a = 0; a < planet.size(); a++)
    {
        for (int i = 0; i < planet.size()-1; i++)
        {
            if (planet[i].GetName() > planet[i+1].GetName())
            {
                temp = planet[i+1];
                planet[i+1] = planet[i];
                planet[i] = temp;
            }
        }
    }
}

void Planet::Remove(string n)
{
    for(int i=0; i < planet.size(); i++)
    {
        if(planet[i].GetName()==n)
        {
            planet[i]=planet[planet.size()-1];
            planet.pop_back();
        }
    }

}

void Planet::FindPlanets(string n)
{
    Planet s;
    s.sortPlanets();
    for(int i=0; i < planet.size(); i++)
    {
        if(planet[i].GetName()==n)
        {
            cout << "Your Planet: "<< planet[i].GetName() << endl;
            cout << "mass: " << planet[i].getMass() << " Kilograms" << endl;
            cout << "Radius: " << planet[i].getRadius() << " Meters" << endl;
            cout << "Area: " << planet[i].calculateArea(i) << endl;
            cout << "Density: " << planet[i].calculateDensity(i) << endl;
            cout << "Gravity: " << planet[i].calculategravity(i) << endl << endl;
        }
    }

}

void Planet::DisplayPlanet() const
{
            cout << "All your Planet: " << endl;
            for(int i =0; i<planet.size(); i++)
            {
                cout << "Planet Name: " << planet[i].GetName() << endl;
                cout << "mass: " << planet[i].getMass() << " Kilograms" << endl;
                cout << "Radius: " << planet[i].getRadius() << " Meters" << endl;
                cout << "Area: " << planet[i].calculateArea(i) << endl;
                cout << "Density: " << planet[i].calculateDensity(i) << endl;
                cout << "Gravity: " << planet[i].calculategravity(i) << endl << endl;
            }
}


int Planet::menu()
{
    int choice;
        system("CLS"); //Flush the stream
        cout << "--Menu--" << endl << endl;
        cout << "1. Add Planets" << endl;
        cout << "2. Sort Planet" << endl;
        cout << "3. Delete Planet" <<endl;
        cout << "4. Find Planet" << endl;
        cout << "5. Displays all" << endl;
        cout << "6. Quit" << endl;
        cin >> choice;

    while((choice < 0 || choice > 6) || (cin.fail() !=0))
    {
        if(cin.fail() !=0)
        {
            cout << "Error! Can't read it! \n" << endl << "Please type it again in number(1~4).";
            cin.clear();
            cin.ignore(256,'\n');
        }
        else if(choice < 0 || choice > 6)
        {
            cout << "Between 1~6 please." << endl; // between 1~4
        }
        cout << "--Menu--" << endl << endl;
        cout << "1. Add Planets" << endl;
        cout << "2. Sort Planet" << endl;
        cout << "3. Delete Planet" <<endl;
        cout << "4. Find Planet" << endl;
        cout << "5. Displays all" << endl;
        cout << "6. Quit" << endl;
        cin >> choice;
    }
    return choice;
}


int main()
{
    Planet s;
    int m;
    bool goOn = true;

    while(goOn==true)
    {
        m=s.menu();
        switch(m)
        {
            case 1:// Planet
            {
                s.AddPlanet();
                break;
            }
            case 2:// Sort Planet
            {
                s.sortPlanets();
                break;
            }
            case 3://Delete Planet
            {
                string name;
                cout << "Name to delete: ";
                cin >> name;
                s.Remove(name);
                system("pause");
                break;
            }
            case 4: //Find planet
            {
                string name;
                cout << "Name to Find: ";
                cin >> name;
                s.FindPlanets(name);
                system("pause");
                break;
            }
            case 5:// Displays all
            {
                s.DisplayPlanet();
                system("pause");
                break;
            }

            case 6: //Quit, couldn't find any method, other than exit(0);
            {
                cout << "Thank you for using the program and See you later!";
                goOn = false;
                break;
            }
        }
    }
    return 0;
}