Membuat Kalkulator dengan C++

Saya kali ini akan post source code kalkulator sederhana dengan dengan bahasa C++, oke deh langsung saja..

berikut source code nya..

#include <iostream>
#include <string>
#include <limits>

using namespace std;

class Calculator
{
    public:
        Calculator();
        int getAnswer () {
            return answer;
        };
        void setAdd (int a,int b) {
            answer=a+b;
        };
        void setMinus (int a,int b) {
            answer=a-b;
        };
        void setMultiply (int a,int b) {
            answer=a*b;
        };
        void setDivide (int a,int b) {
            answer=a/b;
        };
    private:
        double answer;
};

int main()
{
    Calculator calc;
    double first,second;
    int choice;
    bool fail,again;
    char utro;

    do {
        do {
            cout << "\n\tKalkulator Sederhana" << endl;
            cout << "\nPilihan: " << endl;
            cout << "1. Jumlah" << endl;
            cout << "2. Kurang" << endl;
            cout << "3. Kali" << endl;
            cout << "4. Bagi" << endl;
            cout << "\nSilahkan Pilih: ";
            cin >> choice;

            fail = cin.fail();
            cin.clear();
            cin.ignore(numeric_limits<streamsize>::max(), '\n');

        } while(fail == true);

        switch (choice) {
        case 1:
            cout << "\n\tPenjumlahan" << endl;
            cout << "Masukkan Angka pertama : ";
            cin >> first;
            cout << "Masukkan angka kedua : ";
            cin >> second;
            calc.setAdd(first,second);
            cout << "\nHasil nya : " << calc.getAnswer() << endl;

            cout << "Pakai lagi (Y/N)? ";
            cin >> utro;

            if (utro=='Y' || utro=='y') {
                again = true;
            } else {
                again = false;
            }
            break;
        case 2:
            cout << "\n\tPengurangan" << endl;
            cout << "Maukkan anggka pertama : ";
            cin >> first;
            cout << "Masukkan angka kedua : ";
            cin >> second;
            calc.setMinus(first,second);
            cout << "\nHasilnya : " << calc.getAnswer() << endl;

            cout << "pakai lagi(Y/N)? ";
            cin >> utro;

            if (utro=='Y' || utro=='y') {
                again = true;
            } else {
                again = false;
            }
            break;
        case 3:
            cout << "\n\tPerkalian!" << endl;
            cout << "Masukkan angka pertama : ";
            cin >> first;
            cout << "Angka kedua : ";
            cin >> second;
            calc.setMultiply(first,second);
            cout << "\nHasil nya : " << calc.getAnswer() << endl;

            cout << "Lanjut lagi (Y/N)? ";
            cin >> utro;

            if (utro=='Y' || utro=='y') {
                again = true;
            } else {
                again = false;
            }
            break;
        case 4:
            cout << "\n\tPembagian!" << endl;
            cout << "Masukkan angka pertama : ";
            cin >> first;
            cout << "Masukkan angka kedua : ";
            cin >> second;
            calc.setDivide(first,second);
            cout << "\nThe sum is : " << calc.getAnswer() << endl;

            cout << "pakai lagi (Y/N)? ";
            cin >> utro;

            if (utro=='Y' || utro=='y') {
                again = true;
            } else {
                again = false;
            }
            break;
        default:
            cout << "\n\tSalah pilihannya!";
            again = true;
            break;
        }
        cin.get();
    } while(again == true);

    cout << "\n\n\tKalkulator sederhana by ho1onk !\n" << endl;
    return 0;
}