const int led1=8;
const int led2=7;
const int button=3;
void setup()
{
// put your setup code here, to run once:
pinMode(led1,OUTPUT);  // initialize digital pin 8 as an output.
pinMode(led2,OUTPUT);  // initialize digital pin 7 as an output.
pinMode(button,INPUT); // initialize digital pin 3 as an input.

}

void loop() {
  // put your main code here, to run repeatedly:
if (digitalRead(button)==HIGH) // read the input pin:
{
  digitalWrite(led2,HIGH);// turn the LED on (HIGH is the voltage level)
}
else if (digitalRead(button)==LOW) // read the input pin:
{
  digitalWrite(led2,LOW);// turn the LED off (LOW is the voltage level)
}

}