/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Blink
*/

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(1, OUTPUT); // green led at pin 1
   pinMode(4, OUTPUT);// red led at pin 4
    pinMode(3,INPUT ); // button at pin 3 

// the loop function runs over and over again forever
}
void loop() 
{ //int b = digitalRead(4);
  if(digitalRead(3)== HIGH)
{
  digitalWrite(1, HIGH);   // turn the GREEN LED on (HIGH is the voltage level)
  delay(100);                       // wait for a 100 mili second
  digitalWrite(1, LOW);    // turn the Green LED off by making the voltage LOW
  delay(100);                       // wait for a 100 mili second
}
else
{
  digitalWrite(4, HIGH);   // turn the RED LED on (HIGH is the voltage level)
  delay(100);                       // wait for a 100 mili second
  digitalWrite(4, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for a 100 mili second
}}