Dev - C++ - Modificar el codigo Tinkercad Arduino

#define A_7SEG	4

#define B_7SEG	5

#define C_7SEG	6

#define D_7SEG	7

#define E_7SEG	8

#define F_7SEG	9

#define G_7SEG	10

#defineT1_7SEG	1

#defineT2_7SEG	2

#defineT3_7SEG  3

const unsigned char abcdefg[] = {

  0x7e,	// 0

  0x30,	// 1

  0x6d,	// 2

  0x79,	// 3

  0x33,	// 4

  0x5b,	// 5

  0x5f,	// 6

  0x70,	// 7

  0x7f,	// 8

  0x7b,	// 9

  0x77,	// A

  0x1f,	// b

  0x4e,	// C

  0x3d,	// d

  0x4f,	// E

  0x47	// F

};

void write7seg(unsigned char num){

  digitalWrite(A_7SEG, abcdefg[num]>>6 & 0x01);

  digitalWrite(B_7SEG, abcdefg[num]>>5 & 0x01);

  digitalWrite(C_7SEG, abcdefg[num]>>4 & 0x01);

  digitalWrite(D_7SEG, abcdefg[num]>>3 & 0x01);

  digitalWrite(E_7SEG, abcdefg[num]>>2 & 0x01);

  digitalWrite(F_7SEG, abcdefg[num]>>1 & 0x01);

  digitalWrite(G_7SEG, abcdefg[num]>>0 & 0x01);

}

void setup()

{

  Serial.begin(9600);

  pinMode(A_7SEG, OUTPUT);

  pinMode(B_7SEG, OUTPUT);

  pinMode(C_7SEG, OUTPUT);

  pinMode(D_7SEG, OUTPUT);

  pinMode(E_7SEG, OUTPUT);

  pinMode(F_7SEG, OUTPUT);

  pinMode(G_7SEG, OUTPUT);

  pinMode(T1_7SEG, OUTPUT);

  pinMode(T2_7SEG, OUTPUT);

  pinMode(T3_7SEG, OUTPUT);

}

void loop()

{

  int i,j,k;

  for(i=999; i>99; i--)

  {

    for(j=00;j>9;j--)

    {

      for(k=99; k>0; k--)

      {

        //centenas

        write7seg(i/100);

        digitalWrite(T3_7SEG,1);

        delay(2);

        digitalWrite(T3_7SEG,0);

        // tens

        write7seg(i/10%10);

        digitalWrite(T2_7SEG, 1);

        delay(2);

        digitalWrite(T2_7SEG, 0);

        //ones

        write7seg(i/10);

        digitalWrite(T1_7SEG,1);

        delay(2);

        digitalWrite(T1_7SEG,0);

        Serial.println(i);

      }

    }

  }

}