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Menghitung Luas dan volume kubus,balok,bola,limas,tabung pada c++

//menghitung Luas dan volume kubus,balok,bola,limas,tabung pada c++
#include <iostream.h>
#include <stdio.h>
#include <conio.h>
const float phi=3.14;


int main()
{
    int iter=0, pil, a, b, c;
    float volum, luas;
    bool loop=true;

    while(loop)
    {
        clrscr();
        cout << "Selamat datang di program hitung"<< endl;
        cout << "Anda berada pada iterasi ke-"<< iter << endl;
        cout << endl;
        cout << ">> Pilihan Menu: "<< endl;
        cout << "1) Kubus "<< endl;
        cout << "2) Balok"<< endl;
        cout << "3) Bola"<< endl;
        cout << "4) Limas segi empat"<< endl;
        cout << "5) Tabung"<< endl;
        cout << "0) Keluar dari program"<< endl;
        cout << endl;
        cout << "Silahkan masukkan angka pilihan anda: ";
        cin >> pil;

        switch(pil)
        {
        case 1:
            cout << "Perhitungan Volume dan Luas Permukaan Kubus" << endl;
            cout << "Panjang rusuk kubus = ";
            cin >> a;
            volum = a*a*a;
            luas = a*a*6;
            cout << "Volume = " << volum << endl;
            cout << "Luas permukaan = " << luas << endl;
            break;
        case 2:
            cout << "Perhitungan Volume dan Luas Permukaan Balok" << endl;
            cout << "Panjang balok = ";
            cin >> a;
            cout << "Lebar balok = ";
            cin >> b;
            cout << "Tinggi balok = ";
            cin >> c;
            volum = a*b*c;
            luas = ((a * b) + (b * c) + (c * a)) * 2;
            cout << "Volume = " << volum << endl;
            cout << "Luas permukaan = " << luas << endl;
            break;
        case 3:
            cout << "Perhitungan Volume dan Luas Permukaan Bola" << endl;
            cout << "Panjang jari-jari bola = ";
            cin >> a;
            volum = 4/3 * phi * a * a * a;
            luas = 4 * phi * a * a;
            cout << "Volume = " << volum << endl;
            cout << "Luas permukaan = " << luas << endl;
            break;
        case 4:
            cout << "Perhitungan Volume dan Luas Permukaan Limas Segi Empat" << endl;
            cout << "Panjang alas limas = ";
            cin >> a;
            cout << "Lebar alas limas = ";
            cin >> b;
            cout << "Tinggi limas = ";
            cin >> c;
            volum = (a * b * c * 1/3);
            luas = ((a + b) * c) + (a * b);
            cout << "Volume = " << volum << endl;
            cout << "Luas permukaan = " << luas << endl;
            break;
        case 5:
            cout << "Perhitungan Volume dan Luas Permukaan Tabung" << endl;
            cout << "Panjang jari-jari alas tabung = ";
            cin >> a;
            cout << "Tinggi tabung = ";
            cin >> b;
            volum = phi * a * a * b;
            luas = (phi * a * 2) * (b * a);
            cout << "Volume = " << volum << endl;
            cout << "Luas permukaan = " << luas << endl;
            break;
        case 0:
            loop = false;
            break;
        }

        cout << endl << "Tekan enter untuk kembali ke menu awal" << endl;

        getch();
    }
    return 0;
}
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