const int button = 3;     
const int led =  13;      
int buttonStatus = 0;        
void setup() 
{
   pinMode(led, OUTPUT); 
   pinMode(button, INPUT); 
}

void loop() 
{
   
   buttonStatus = digitalRead(button); 


   if (buttonStatus == HIGH)  
   {
      digitalWrite(led, HIGH); 
   } 
   else 
   {
      digitalWrite(led, LOW); 
   }
}