int Angka1 = 35,Angka2 = 8, Hasil;
char Operator = 'x';
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
  switch (Operator){
  case '+':
   Hasil = Angka1 + Angka2;
   Serial.println(String(Angka1) + "+" + String(Angka2) + "=" + String(Hasil));
   break;
  case '-':
   Hasil = Angka1 - Angka2;
   Serial.println(String(Angka1) + "-" + String(Angka2) + "=" + String(Hasil));
   break;
  case'x':
   Hasil = Angka1 * Angka2;
   Serial.println(String(Angka1) + "x" + String(Angka2) + "=" + String(Hasil));
   break;
  case '/':
   Hasil = Angka1 / Angka2;
   Serial.println(String(Angka1) + "/" + String(Angka2) + "=" + String(Hasil));
   break;
}
} 

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

}