int button[4]= {2,3,4,5};
int LED[4]={8,9,10,11}; 

 void setup() {
  for(int i=0;i<4;i++){
  pinMode(button[i], INPUT);
   digitalWrite(button[i], HIGH);
 }
  for(int i=0;i<4;i++){
   pinMode(LED[i],OUTPUT);     
 }
         
 }
        
void loop () {
  for(int i=0;i<1;i++){
  if (digitalRead(button[i])==LOW)
  for(int i=0;i<1;i++){
   digitalWrite(LED[i], HIGH);
  } else{
   digitalWrite(LED[i], LOW);
  }
  
  }
 
  for(int i=1;i<2;i++){
  if (digitalRead(button[i])==LOW)
  for(int i=1;i<2;i++){
   digitalWrite(LED[i], HIGH);
  } else{
   digitalWrite(LED[i], LOW);
  }
  
  }
  for(int i=2; i<3; i++){
  if (digitalRead(button[i])==LOW)
  for(int i=2;i<3;i++){
   digitalWrite(LED[i], HIGH);
  } else{
   digitalWrite(LED[i],LOW);
  }
  
  }
  for(int i=3; i<4; i++){
  if(digitalRead(button[i])==LOW)
  for(int i=3; i<4; i++){
   digitalWrite(LED[i], HIGH);
  } else{
   digitalWrite(LED[i], LOW);
  } 
  
  }
 }