switch(n) {
    case 0:
       cout << "You typed zero.\n";
       break;
    case 3:
    case 5:
    case 7:
	   cout << "n is a prime number\n";
       break;
    case 2: cout << "n is a prime number\n";
    case 4:
    case 6:
    case 8:
       cout << "n is an even number\n";
       break;
    case 1:
    case 9:
	   cout << "n is a perfect square\n";
       break;
    default:
       cout <<  "Only single-digit numbers are allowed\n";
       break;
}