void setup() {
  Serial.begin(9600);

}
void loop() {
// 3. Even or Odd
  delay(1000);
  int num = Serial.read();
  // Serial.write(num);
  if (Serial.available() > 0) {
    if (num > 47 && num < 58) {
      // Serial.println(num);
      int value = num - 48;
      Serial.println((String)"Ascii Code of "+value+" is "+num);
      if (value % 2 == 0) {
        // Serial.print(num);
        Serial.println((String)value + " is Even");
      }
      else {
        Serial.println((String)value + " is Odd");
      }
      delay(1000);
    }
    else {
      Serial.println("Input Only Numbers");
    }
  }
}