int inputPins[] = {2, 3, 4, 5}; 
int ledPins[] = {10, 11, 12, 13};

void setup() {

for (int index = 0; index < 4; index++)
 {
 pinMode(ledPins[index], OUTPUT); 
 pinMode(inputPins[index], INPUT_PULLUP); 
 }

  // put your setup code here, to run once:

}

void loop() {

 for (int index = 0; index < 4; index++)
 {
 int val = digitalRead(inputPins[index]); 
 if (val == LOW) 
 {
 digitalWrite(ledPins[index], HIGH); 
 }
 else
 {
 digitalWrite(ledPins[index], LOW); // turn LED off
 }
 }

  // put your main code here, to run repeatedly:

}