void setup () {
  Serial.begin (9600);
  Serial.println ("Selamat datang di program PENJUMLAHAN EMPAT ANGKA");
}
  void loop() {
  float a;
  float b;
  float c;
  float d;
  float hasil;
  Serial.print ("masukkan nilai A = ");
  while(Serial.available () == 0) {}
  delay (4000);
  a= Serial.parseFloat ();
  Serial.println (a);

  Serial.print ("masukkan nilai B = ");
  while (Serial.available() == 0) {}
  delay(4000);
  b= Serial.parseFloat ();
  Serial.println (b);

  Serial.print ("masukkan nilai C = ");
  while (Serial.available() == 0) {}
  delay(4000);
  c= Serial.parseFloat ();
  Serial.println (c);

  Serial.print ("masukkan nilai D = ");
  while (Serial.available() == 0) {}
  delay(4000);
  d= Serial.parseFloat ();
  Serial.println (d);

  hasil = a+b+c+d;
  Serial.print ("Hasil penjumlahan =");
  Serial.println(hasil);
  Serial.println("\n");
  delay(2000);
}