int timer = 500;  // The higher the number, the slower the timing.
int ledPins[] = {
  0,1,2,3, 4, 5
};                 // an array of pin numbers to which LEDs are attached
int pinCount = 6;  // the number of pins (i.e. the length of the array)

bool A,B;
void setup() {
  // the array elements are numbered from 0 to (pinCount - 1).
  // use a for loop to initialize each pin as an output:
  for (int thisPin = 0; thisPin < pinCount; thisPin++) {
    pinMode(ledPins[thisPin], OUTPUT);
  // input for truth tables      
  pinMode(6, INPUT);
  pinMode(7, INPUT);

    //initialize all led as OFF
    digitalWrite(ledPins[thisPin], LOW);
  }
  /*
    initialize serial port (USB) as UART 9600 8-N-1
    to view Input/output on  a terminal
  */
  Serial.begin(9600); 


}

void truthled(void)
{

    A=digitalRead(6);
    B=digitalRead(7);
 
    if(A&B){
      Serial.println("AND = 1");
     digitalWrite(ledPins[3], HIGH);
    }
    else{
      digitalWrite(ledPins[3], LOW);
      Serial.println("AND = 0");
    }

     if(A|B){
      Serial.println("OR = 1");
      digitalWrite(ledPins[4], HIGH);
    }
    else{
      digitalWrite(ledPins[4], LOW);
      Serial.println("OR = 0");
    }
     if(A^B){
      digitalWrite(ledPins[5], HIGH);
    }
    else
      digitalWrite(ledPins[5], LOW);
}


void loop() {
  int current, previous;
    // put your main code here, to run repeatedly:
    // Shift led 
    previous=3;
    current=0;
    /*
    //blink
  for(current=0; current<pinCount;current++){
    digitalWrite(ledPins[current], HIGH);
    delay(500);
   digitalWrite(ledPins[current], LOW);
  }
  */
  
  //Truth table for and, or and xor
  truthled();
}