int ledpin = 4;
int pushpin = 2;
int val;
void setup()  {
  pinMode(ledpin, OUTPUT);
  pinMode(pushpin, INPUT);
}
void loop()  {
   val =digitalRead(pushpin);
  if(val == HIGH);
  {
    digitalWrite(ledpin, HIGH);
  }
  else {
    digitalWrite(ledpin, LOW);
} 
}