cout << "The squre of x is: " << 2 * 2<<endl;

cout << endl << "=========================";
cout << endl << "-----> Hello world! <----";
cout << endl << 10 + 45 << "Resualt : ";
cout << endl << 5 * 2 / 10 << "Resualt : ";
cout << endl << 1 + 10 << "Resualt : ";
cout << endl << "D" << "C" << "A";
cout << endl << 1 + 3 + 100 + 220 << " = " << "1 + 3 + 100 + 220";
cout << endl << "=========================";

