int LED = 8;                // Sets LED = 8 
int button = 7;           // Sets button = 7;
int buttonpress = 0;      // Sets status of button to 0 which is off        

void setup() 
{
    pinMode(LED, OUTPUT);       //Controls digital Pin 8 which controls LED  
    pinMode (button, INPUT);   //Controls digital Pin 7 which controls button 
}

void loop() 
 {
  buttonpress=digitalRead(button);    // Checks that button has been pressed
     
  if (buttonpress == HIGH)            
      {
          digitalWrite (LED, HIGH); //Turns on LED
          delay(500);
          digitalWrite (LED, LOW); //Turns off LED
          buttonpress = 0;
          
       } 
else
      { 
          digitalWrite(LED, LOW); //the LED shouldn't light up
      }
 }