seven segment display with arduino

Hi
--------------------------------------------------------- 
here is the circuit diagram
----------------------------------------------------------
HERE is the code for without library
--------------------------------------------------------------------------------------

/*
 * ER BROS LAB
 */
#define a 6
#define b 7
#define c 8
#define d 9
#define e 10
#define f 11
#define g 12
#define dp 13

void setup() {
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(dp, OUTPUT);


}
void n0() {
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,HIGH);
  digitalWrite(dp,HIGH);
}
void n1() {
  digitalWrite(a,HIGH);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
  digitalWrite(dp,HIGH);
}
void n2() {
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,HIGH);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,HIGH);
  digitalWrite(g,LOW);
  digitalWrite(dp,HIGH);
}
void n3() {
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,LOW);
  digitalWrite(dp,HIGH);
}
void n4() {
  digitalWrite(a,HIGH);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
  digitalWrite(dp,HIGH);
}
void n5() {
  digitalWrite(a,LOW);
  digitalWrite(b,HIGH);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,HIGH);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
  digitalWrite(dp,HIGH);
}
void n6() {
  digitalWrite(a,LOW);
  digitalWrite(b,HIGH);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
  digitalWrite(dp,HIGH); 
}
void n7() {
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
  digitalWrite(dp,HIGH);
}
void n8() {
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
  digitalWrite(dp,HIGH);
}
void n9() {
  digitalWrite(a,LOW);
  digitalWrite(b,LOW);
  digitalWrite(c,LOW);
  digitalWrite(d,LOW);
  digitalWrite(e,HIGH);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
  digitalWrite(dp,HIGH);
}
void loop() {
  n0();
  delay(1000);
  n1();
  delay(1000);
  n2();
  delay(1000);
  n3();
  delay(1000);
  n4();
  delay(1000);
  n5();
  delay(1000);
  n6();
  delay(1000);
  n7();
  delay(1000);
  n8();
  delay(1000);
  n9();
  delay(1000);
  


} 
-------------------------------------------------------------------------------------------------------------------
arduino library---
https://www.arduinolibraries.info/libraries/sev-seg
------------------------------------------------------------------------------------------------------
Here is the code with liberary
#include "SevSeg.h"

SevSeg sevseg; 
int i;
void setup(){
    byte numDigits = 1;
    byte digitPins[] = {};
    byte segmentPins[] = {6, 7, 8, 9, 10, 11, 12, 13};
    bool resistorsOnSegments = true;

    byte hardwareConfig = COMMON_ANODE; 
    sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments);
    sevseg.setBrightness(20);
}

void loop(){
  for (i=0; i<=9; i++) {
    delay(1000);
        sevseg.setNumber(i);
        sevseg.refreshDisplay();   
  }     
}
--------------------------------------------

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