my code works it just isn't finished

i'm making a code and i'm new to c++ can i get ann example of how to get my code to prefect the objective. here is my game's code

include

include

using namespace std;

int main(int argc, char *argv(void)) { std::cout << "what is 10 + 10?" << std::endl;

std::cout << "20" << std::endl;
std::cout << "70" << std::endl;
std::cout << "100" << std::endl;
std::cout << "10000" << std::endl;
std::cout << "10000000" << std::endl;

int choice;
cin >> choice;

switch (choice) {
    case 20:
        cout << "correct!" << endl;
        break;

    case 70:
        cout << "try again!" << endl;
        break;

    case 100:
        cout << "try again!" << endl;
        break;

    case 10000:
        cout << "try again!" << endl;
        break;
    case 10000000:
        cout << "try again!" << endl;
        break;
    default:
        cout << "unknown type" << endl;
}
system("PAUSE");
return 0;

}

please help