Interfacing 7 Segment Display with Arduino

#define P0 12
#define P1 11
#define P2 10
#define P3 9
#define P4 8
#define P5 7
#define P6 6
#define LED 3

#define LIGHTSEG0 digitalWrite(P0, HIGH)
#define LIGHTSEG1 digitalWrite(P1, HIGH)
#define LIGHTSEG2 digitalWrite(P2, HIGH)
#define LIGHTSEG3 digitalWrite(P3, HIGH)
#define LIGHTSEG4 digitalWrite(P4, HIGH)
#define LIGHTSEG5 digitalWrite(P5, HIGH)
#define LIGHTSEG6 digitalWrite(P6, HIGH)

#define OFFSEG0 digitalWrite(P0, LOW)
#define OFFSEG1 digitalWrite(P1, LOW)
#define OFFSEG2 digitalWrite(P2, LOW)
#define OFFSEG3 digitalWrite(P3, LOW)
#define OFFSEG4 digitalWrite(P4, LOW)
#define OFFSEG5 digitalWrite(P5, LOW)
#define OFFSEG6 digitalWrite(P6, LOW)


void printOne(){
  digitalWrite(P1, HIGH);
  digitalWrite(P2, HIGH);
  delay(1000);
  digitalWrite(P1, LOW);
  digitalWrite(P2, LOW);
}

void printTwo(){
  digitalWrite(P0, HIGH);
  digitalWrite(P1, HIGH);
  digitalWrite(P6, HIGH);
  digitalWrite(P4, HIGH);
  digitalWrite(P3, HIGH);
  delay(1000);
  digitalWrite(P0, LOW);
  digitalWrite(P1, LOW);
  digitalWrite(P6, LOW);
  digitalWrite(P4, LOW);
  digitalWrite(P3, LOW);
}

void printThree(){
  digitalWrite(P0, HIGH);
  digitalWrite(P1, HIGH);
  digitalWrite(P6, HIGH);
  digitalWrite(P2, HIGH);
  digitalWrite(P3, HIGH);
  delay(1000);
  digitalWrite(P0, LOW);
  digitalWrite(P1, LOW);
  digitalWrite(P6, LOW);
  digitalWrite(P2, LOW);
  digitalWrite(P3, LOW);
}

void printFour(){
  digitalWrite(P1, HIGH);
  digitalWrite(P5, HIGH);
  digitalWrite(P6, HIGH);
  digitalWrite(P2, HIGH);
  delay(1000);
  digitalWrite(P1, LOW);
  digitalWrite(P5, LOW);
  digitalWrite(P6, LOW);
  digitalWrite(P2, LOW);
}

void printFive(){
  digitalWrite(P0, HIGH);
  digitalWrite(P5, HIGH);
  digitalWrite(P6, HIGH);
  digitalWrite(P2, HIGH);
  digitalWrite(P3, HIGH);
  delay(1000);
  digitalWrite(P0, LOW);
  digitalWrite(P5, LOW);
  digitalWrite(P6, LOW);
  digitalWrite(P2, LOW);
  digitalWrite(P3, LOW);
}

void printSix(){
  digitalWrite(P0, HIGH);
  digitalWrite(P5, HIGH);
  digitalWrite(P6, HIGH);
  digitalWrite(P2, HIGH);
  digitalWrite(P3, HIGH);
  digitalWrite(P4, HIGH);
  delay(1000);
  digitalWrite(P0, LOW);
  digitalWrite(P5, LOW);
  digitalWrite(P6, LOW);
  digitalWrite(P2, LOW);
  digitalWrite(P3, LOW);
  digitalWrite(P4, LOW);
}

void printSeven(){
  LIGHTSEG0;
  LIGHTSEG1;
  LIGHTSEG2;
  delay(1000);
  OFFSEG0;
  OFFSEG1;
  OFFSEG2;
}

void printEight(){
  LIGHTSEG0;
  LIGHTSEG1;
  LIGHTSEG2;
  LIGHTSEG3;
  LIGHTSEG4;
  LIGHTSEG5;
  LIGHTSEG6;
  delay(1000);
  OFFSEG0;
  OFFSEG1;
  OFFSEG2;
  OFFSEG3;
  OFFSEG4;
  OFFSEG5;
  OFFSEG6;
}


void printNine(){
  LIGHTSEG0;
  LIGHTSEG1;
  LIGHTSEG2;
  LIGHTSEG3;
  LIGHTSEG5;
  LIGHTSEG6;
  delay(1000);
  OFFSEG0;
  OFFSEG1;
  OFFSEG2;
  OFFSEG3;
  OFFSEG5;
  OFFSEG6;
}

void printZero(){
  LIGHTSEG0;
  LIGHTSEG1;
  LIGHTSEG2;
  LIGHTSEG3;
  LIGHTSEG4;
  LIGHTSEG5;
  delay(1000);
  OFFSEG0;
  OFFSEG1;
  OFFSEG2;
  OFFSEG3;
  OFFSEG4;
  OFFSEG5;
}


void setup() {
  Serial.begin(9600);
  Serial.println("Initializing Pins...");
  pinMode(P0, OUTPUT);
  pinMode(P1, OUTPUT);
  pinMode(P2, OUTPUT);
  pinMode(P3, OUTPUT);
  pinMode(P4, OUTPUT);
  pinMode(P5, OUTPUT);
  pinMode(P6, OUTPUT);
  pinMode(LED , OUTPUT);
  delay(1000);
}

void loop() {

  int pot_val = analogRead(A2);
  int mp_val = map(pot_val, 1, 1023, 0, 9);

  if(pot_val < 100 || pot_val >800){
    digitalWrite(LED, HIGH);
  }
  else{
    digitalWrite(LED, LOW);
  }

  Serial.print("Potentiometer Value: ");
  Serial.println(pot_val);

  Serial.print("Mapped Value: ");
  Serial.println(mp_val);

  switch(mp_val){
     case 1:
           Serial.println("Printing 1");
           printOne();
           delay(1000);
           break;
     case 2:
           Serial.println("Printing 2");
           printTwo();
           delay(1000);
           break;
     case 3:
           Serial.println("Printing 3");
           printThree();
           delay(1000);
           break;
     case 4:
           Serial.println("Printing 4");
           printFour();
           delay(1000);
           break;
     case 5:
           Serial.println("Printing 5");
           printFive();
           delay(1000);
           break;
     case 6:
           Serial.println("Printing 6");
           printSix();
           delay(1000);
           break;
     case 7:
           Serial.println("Printing 7");
           printSeven();
           delay(1000);
           break;
     case 8:
           Serial.println("Printing 8");
           printEight();
           delay(1000);
           break;
     case 9:
           Serial.println("Printing 9");
           printNine();
           delay(1000);
           break;
     default:
           Serial.println("Printing 0");
           printZero();
           delay(1000);
  }

  Serial.println(" ");

}