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

using namespace std;

int main()
{
    system("CLS"); //Flush the stream
    int loop = 1;
    int choice;
    string getinput;
    bool done = false;

    while (loop ==1)
    {
        system("CLS"); //Flush the stream
        cout << "--Menu--" << endl << endl;
        cout << "1. Cube" << endl;
        cout << "2. Rectengular Prism" << endl;
        cout << "3. Sphere" << endl;
        cout << "4. Cylinder" << endl;
        cout << "5. Cone" << endl;
        cout << "6. Quit" << endl;  // menu
    cin >> choice;


    if(choice < 0 || choice > 7)
        cout << "Between 1~6 please." << endl; // between 1~6
        system("pause");

    switch(choice)
    {
        case 1:// Cube
        {
            system("CLS");
            double Cube_Length = 0.0;
            cout << "One side length? " << endl;
            cin >> Cube_Length;

            while(Cube_Length <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> Cube_Length;
        }
            cout << "Surface area: " << (Cube_Length*Cube_Length)*6 << endl; // calculates surface ares
            cout << "Volume: " << Cube_Length*Cube_Length*Cube_Length << endl;
            system("pause");
            break;
        }


        case 2://Rectangular
        {
            system("CLS");
            double RP_Length = 0.0, RP_Width = 0.0, RP_Height = 0.0;
            cout << "length? " << endl;
            cin >> RP_Length;

            while(RP_Length <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> RP_Length;
            }


            cout << "Width? " << endl;
            cin >> RP_Width;

            while(RP_Width <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> RP_Width;
            }


            cout << "Height? " << endl;
            cin >> RP_Height;

            while(RP_Height <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> RP_Height;
            }


            cout << "Surface area: " << ((RP_Length*RP_Width)*2)+((RP_Width*RP_Height)*2)+((RP_Length*RP_Height)*2) << endl;
            cout << "Volume: " << RP_Length*RP_Width*RP_Height << endl;
            system("pause");
            break;
        }


        case 3: //Sphere
        {
            system("CLS");
            double Sph_radius = 0.0;
            cout << "Radius? " << endl;
            cin >> Sph_radius;

            while(Sph_radius <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> Sph_radius;
            }

            cout << "Surface area: " << 4*M_PI*pow(Sph_radius, 2) << endl;
            cout << "Volume: " << (4*M_PI*pow(Sph_radius, 3))/3 << endl;
            system("pause");
            break;
        }


          case 4://Cylinder
        {
            system("CLS");
            double Cylin_radius = 0.0, Cylin_height = 0.0;
            cout << "Radius? " << endl;
            cin >> Cylin_radius;

            while(Cylin_radius <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> Cylin_radius;
            }

            cout << "Height? " << endl;
            cin >> Cylin_height;

            while(Cylin_height <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> Cylin_height;
            }

            cout << "Surface area: " << (2*M_PI*pow(Cylin_radius, 2)) + (2*M_PI*Cylin_radius*Cylin_height) << endl;
            cout << "Volume: " << M_PI*Cylin_height*pow(Cylin_radius, 2) << endl;
            system("pause");
            break;
        }


          case 5://Cone
        {
            system("CLS");
            double Cone_radius = 0.0, Cone_height = 0.0;
            cout << "Radius? " << endl;
            cin >> Cone_radius;

            while(Cone_radius <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> Cone_radius;
            }

            cout << "Height? " << endl;
            cin >> Cone_height;

            while(Cone_height <= 0) {
            cout << "Cannot be negative, Try again: ";
            cin >> Cone_height;
            }

            cout << "Surface area: " << M_PI*Cone_radius*sqrt(pow(Cone_radius, 2)+pow(Cone_height, 2)) << endl;
            cout << "Volume: " << (M_PI*pow(Cone_radius, 2)*Cone_height)/3 << endl;
            system("pause");
            break;
        }


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