Interfacing Switch with LED using Arduino

Circuit Diagram:

Code:

const int buttonPin = 2;           // the number of the pushbutton pin
const int ledPin =  8;                  // the number of the LED pin

int buttonState = 0;             // variable for reading the pushbutton status

void setup() {           // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);          // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin); // read the state of the pushbutton value:

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == LOW) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
  }
  else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }

}