char huruf = 'e';
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
switch (huruf) {
  case 'a':
  case 'i':
  case 'u':
  case 'e':
  case 'o':
Serial.print(String(huruf) + " adalah huruf vokal");
break;
  case 'b':
  case 'c':
  case 'd':
  case 'f':
  case 'g':
  case 'h':
  case 'j':
  case 'k':
  case 'l':
  case 'm':
  case 'n':
  case 'p':
  case 'q':
  case 'r':
  case 's':
  case 't':
  case 'v':
  case 'w':
  case 'x':
  case 'y':
  case 'z':
Serial.print(String(huruf) + "adalah huruf konsonan");
}
}

void loop() {
  // put your main code here, to run repeatedly:

}