int button;
void setup() {
  // put your setup code here, to run once:

   pinMode(13, OUTPUT);
   pinMode(7, INPUT);
}

void loop() {
  //u put your main code here, to run repeatedly:
  button = digitalRead(7);
  if(button == 0){
    digitalWrite(13, HIGH);
  }else{
    digitalWrite(13, LOW);
  }
  delay(1000);
}