/* Open serial port Enter number to display on seven segment */

int incomingByte = 0; 
long number,first,second,third,fourth;
int i,out[4];
void setup() {
        pinMode(3,OUTPUT);         /* CARRY FOURTH BIT CONNECTED TO A OF DECODER */
        pinMode(4,OUTPUT);        /* CARRY THIRD BIT CONNECTED TO B OF DECODER */  
        pinMode(5,OUTPUT);       /* CARRY SECOND BIT CONNECTED TO C OF DECODER */ 
        pinMode(6,OUTPUT);      /* CARRY FIRST BIT(MSB) CONNECTED TO D OF DECODER */
        Serial.begin(9600);    /* Opens serial port, sets data rate to 9600 bps */
}
void loop() {
        if (Serial.available() > 0) {                                 /* send data only when it receive data */
              incomingByte = Serial.read();                          /* read the incoming byte */
              String thisString = String(incomingByte, BIN);        /* converting into string */
              Serial.print("Entered number is : ");
              Serial.println(thisString);
              number = thisString.toInt();                       /* casting into integer */
              Serial.println(number);
              for (i = 0; i<4; i++){
                  out[i] = int(number%10);
                  number = number/10;
                  if (out[i]==0)
                  {
                    digitalWrite(i+3,LOW);
                  }
                  else 
                    digitalWrite(i+3,HIGH);
              }
             
        }
}