cout 간단한 출력.!!

    cout << "Hello World!" << endl;

    cout << "time : " << 12 <<" : " << 03 << "\n";

    cout << "The " << endl;

    cout << "a b c " ;

    cout << "d e f" << endl;

    cout << " sum 10 + 3 :" << 10+3 << endl;

    cout << "(float) 5/13 : " << (float)5/13 << endl;

    cout << "(double) 8000 * 10000 : "

         << (double) 8000 * 10000<< endl;