#define led 7
#define button 4
int val=0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  pinMode(button, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  val=digitalRead(button);
  digitalWrite(led,val);
  Serial.println(val);
  delay(100);

}