void setup() {
  Serial.begin(9600);
  pinMode(3, OUTPUT);
  pinMode(4, INPUT_PULLUP);
  pinMode(2, INPUT_PULLUP);
}

void loop() {
  int a= digitalRead(4);
  if(a==0){
    digitalWrite(3, HIGH);
    Serial.println("PUSH BOTTON 1 is on and LED is on.");
  }
  int b= digitalRead(2);
  if (b==0){
    digitalWrite(3, LOW);
    Serial.println("PUSH BOTTON 2 is on and LED is off.");
  }
}