function testCase(a) {
    var x = " ";
    var a;

switch (a) {
  case 0:x = "Ноль";
    break;
   case 1:x  = "Один";
    break;
   case 2:x = "Два";
    break;
     case 3:x = "Три";
    break;
     case 4:x = "Четыре";
    break;
        case 5:x = "Пять";
    break;
     case 6:x = "Шесть";
    break;
        case 7:x = "Семь";
    break;
         case 8:x = "Восемь";
    break;
         case 9:x = "Девять";
         }
    return x;
}