#define led1(x) digitalWrite(13, x? HIGH:LOW)
#define led2(x) digitalWrite(12, x? HIGH:LOW)
#define led3(x) digitalWrite(11, x? HIGH:LOW)
#define led4(x) digitalWrite(10, x? HIGH:LOW)

void setup() 
{ for(uint8_t i=10;i<=13;i++)
    pinMode(i,OUTPUT);
}

void LEDs(uint8_t no) // no6 = 0110
{ led1(no & 1<<0);
  led2(no & 1<<1);  
  led3(no & 1<<2);  
  led4(no & 1<<3);  
}

uint8_t a[10] = {1,3,7,15,14,12,8,0};
uint8_t b[10] = {8,12,14,15,7,3,1,0};
uint16_t masa=100;
void loop() 
{ for(uint8_t i=0;i<8;i++)
  { LEDs(a[i]);
    delay(masa);
  }
  for(uint8_t i=0;i<8;i++)
  { LEDs(b[i]);
    delay(masa);
  }
}


//--- DIGITAL OUTPUT
//--- MACRO DEFINITION
//--- MULTIPLE MACRO DEFINITION
//--- BITWISE OPERATION

//    0000 0001 --> 1

//  128 64  32  16  8421   
//    0000 0000 --> 8
//    0000 1000   

//    0000 0100 --> 1 << 2
//    0000 0010 --> 1 << 1
//    0000 1000 --> 1 << 3

//         8421   
//    0000 0100 --> 4 << 2
//    0001 0000 --> 4 << 2

//    0000 0100 --> 4 >> 1
//    0000 0010 --> 4 >> 1

//  x=0
//  (x & 1) = 0 & 1 ==> 0

//  x=1
//  (x & 1) = 1 & 1 ==> 1