int button1 = 9;  
int button2 = 8;
int button3 = 7;

String nama = "Rohmah Yuli Cahyani";
String nim = "230534601845";
String prodi = "S1 Pendidikan Teknik Elektro";

void setup() {
  pinMode(button1, INPUT_PULLUP);   
  pinMode(button2, INPUT_PULLUP);
  pinMode(button3, INPUT_PULLUP);
  Serial.begin(9600);          
}

void loop() {

  if (digitalRead(button1) == LOW) {
    Serial.print("Nama  : ");
    Serial.println(nama);
  delay(1000);
  }else if (digitalRead (button2) == LOW){
    Serial.print("NIM   :");
    Serial.println(nim);
    delay(1000);
  }else if(digitalRead (button3)== LOW){
    Serial.print("Prodi :");
    Serial.println (prodi);
    delay(1000);
  }



}