7 Digit LED Matrix Arduino Binary Counter

//7 Digit Arduino LED Matrix Binary Counter
//Counter 1-9999999
/* I did this project by using 5x7 LED Matrix with its pins 7, 10, 3, 1 for common cathodes to Arduino pins 9, 6, 17(A3) & 19(A5) respectively while anodes matrix pins 12, 11, 2, 9, 4, 5 & 6 to Arduino pins 4, 5, 18(A4), 7, 16, 15 & 14 correspondingly. */
#define A 9
#define B 6
#define C 17
#define D 19
// Pins driving common cathodes
#define CC1 4
#define CC2 5
#define CC3 18
#define CC4 7
#define CC5 16
#define CC6 15
#define CC7 14
// Pins for A, B, C, D in sequence
const int segs[4] = {9, 6, 17, 19};
// Segments that make each number
const byte numbers[10] = {0b1111, 0b1110, 0b1101, 0b1100, 0b1011, 0b1010, 0b1001, 0b1000, 0b0111, 0b0110};
 void setup() {
  pinMode(9, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(14, OUTPUT);
}
void loop() {
  for (int digit1=0; digit1 < 10; digit1++) {
    for (int digit2=0; digit2 < 10; digit2++) {
      for(int digit3=0; digit3 < 10; digit3++) {
        for(int digit4=0; digit4 < 10; digit4++) {
          for(int digit5=0; digit5 < 10; digit5++) {
             for(int digit6=0; digit6 < 10; digit6++) {
               for(int digit7=0; digit7 < 10; digit7++) {
      unsigned long startTime = millis();
      for (unsigned long elapsed=0; elapsed < 200; elapsed = millis() - startTime) {
        lightDigit1(numbers[digit1]);
        delay(5);
        lightDigit2(numbers[digit2]);
        delay(5);
        lightDigit3(numbers[digit3]);
        delay(5);
        lightDigit4(numbers[digit4]);
        delay(5);
        lightDigit5(numbers[digit5]);
        delay(5);
        lightDigit6(numbers[digit6]);
        delay(5);
        lightDigit7(numbers[digit7]);
        delay(5);
  }
}
}
}
}
}
}
}
}

void lightDigit1(byte number) {
  digitalWrite(CC1, LOW);
  digitalWrite(CC2, LOW);
  digitalWrite(CC3, LOW);
  digitalWrite(CC4, LOW);
  digitalWrite(CC5, LOW);
  digitalWrite(CC6, LOW);
  digitalWrite(CC7, HIGH);
  lightSegments(number);
}
void lightDigit2(byte number) {
  digitalWrite(CC1, LOW);
  digitalWrite(CC2, LOW);
  digitalWrite(CC3, LOW);
  digitalWrite(CC4, LOW);
  digitalWrite(CC5, LOW);
  digitalWrite(CC6, HIGH);
  digitalWrite(CC7, LOW);
  lightSegments(number);
}
void lightDigit3(byte number) {
  digitalWrite(CC1, LOW);
  digitalWrite(CC2, LOW);
  digitalWrite(CC3, LOW);
  digitalWrite(CC4, LOW);
  digitalWrite(CC5, HIGH);
  digitalWrite(CC6, LOW);
  digitalWrite(CC7, LOW);
  lightSegments(number);
}
void lightDigit4(byte number) {
  digitalWrite(CC1, LOW);
  digitalWrite(CC2, LOW);
  digitalWrite(CC3, LOW);
  digitalWrite(CC4, HIGH);
  digitalWrite(CC5, LOW);
  digitalWrite(CC6, LOW);
  digitalWrite(CC7, LOW);
  lightSegments(number);
}
void lightDigit5(byte number) {
  digitalWrite(CC1, LOW);
  digitalWrite(CC2, LOW);
  digitalWrite(CC3, HIGH);
  digitalWrite(CC4, LOW);
  digitalWrite(CC5, LOW);
  digitalWrite(CC6, LOW);
  digitalWrite(CC7, LOW);
  lightSegments(number);
}
void lightDigit6(byte number) {
  digitalWrite(CC1, LOW);
  digitalWrite(CC2, HIGH);
  digitalWrite(CC3, LOW);
  digitalWrite(CC4, LOW);
  digitalWrite(CC5, LOW);
  digitalWrite(CC6, LOW);
  digitalWrite(CC7, LOW);
  lightSegments(number);
}
void lightDigit7(byte number) {
  digitalWrite(CC1, HIGH);
  digitalWrite(CC2, LOW);
  digitalWrite(CC3, LOW);
  digitalWrite(CC4, LOW);
  digitalWrite(CC5, LOW);
  digitalWrite(CC6, LOW);
  digitalWrite(CC7, LOW);
  lightSegments(number);
}

void lightSegments(byte number) {
  for (int i = 0; i < 4; i++) {
    int bit = bitRead(number, i);
    digitalWrite(segs[i], bit);
  }
}