what is meaning of BitSet = bitRead(numeral[number], segment);

const byte numeral[10] = {
  //ABCDEFG /dp
  B11111100,  // 0
  B01100000,  // 1
  B11011010,  // 2
  B11110010,  // 3
  B01100110,  // 4
  B10110110,  // 5
  B00111110,  // 6
  B11100000,  // 7
  B11111110,  // 8
  B11100110,  // 9
};

// pins for decimal point and each segment
//                          dp,G,F,E,D,C,B,A
const int segmentPins[8] = { 5,9,8,7,6,4,3,2};

void setup()
{
  for(int i=0; i < 8; i++)
  {
    pinMode(segmentPins[i], OUTPUT); // set segment and DP pins to output
  }
}


void loop()
{
  for(int i=0; i <= 10; i++)
  {
    showDigit(i);
    delay(1000);
  }
  // the last value if i is 10 and this will turn the display off
  delay(2000);  // pause two seconds with the display off
}

// Displays a number from 0 through 9 on a 7-segment display
// any value not within the range of 0-9 turns the display off
void showDigit( int number)
{
  boolean isBitSet;

  for(int segment = 1; segment < 8; segment++)
  {
    if( number < 0 || number > 9){
      isBitSet = 0;   // turn off all segments
    }
    else{
      // isBitSet will be true if given bit is 1
      isBitSet = bitRead(numeral[number], segment);
    }
    isBitSet = ! isBitSet; // remove this line if common cathode display
    digitalWrite( segmentPins[segment], isBitSet);
  }
}

What is the meaning of BitSet = bitRead(numeral[number], segment);?

const byte numeral[10] = {
  //ABCDEFG /dp
  B11111100,  // 0
  B01100000,  // 1
  B11011010,  // 2
  B11110010,  // 3
  B01100110,  // 4
  B10110110,  // 5
  B00111110,  // 6
  B11100000,  // 7
  B11111110,  // 8
  B11100110,  // 9
};

// pins for decimal point and each segment
//                          dp,G,F,E,D,C,B,A
const int segmentPins[8] = { 5,9,8,7,6,4,3,2};

void setup()
{
  for(int i=0; i < 8; i++)
  {
    pinMode(segmentPins[i], OUTPUT); // set segment and DP pins to output
  }
}


void loop()
{
  for(int i=0; i <= 10; i++)
  {
    showDigit(i);
    delay(1000);
  }
  // the last value if i is 10 and this will turn the display off
  delay(2000);  // pause two seconds with the display off
}

// Displays a number from 0 through 9 on a 7-segment display
// any value not within the range of 0-9 turns the display off
void showDigit( int number)
{
  boolean isBitSet;

  for(int segment = 1; segment < 8; segment++)
  {
    if( number < 0 || number > 9){
      isBitSet = 0;   // turn off all segments
    }
    else{
      // isBitSet will be true if given bit is 1
      isBitSet = bitRead(numeral[number], segment);
    }
    isBitSet = ! isBitSet; // remove this line if common cathode display
    digitalWrite( segmentPins[segment], isBitSet);
  }
}

const byte numeral[10] = { //ABCDEFG /dp B11111100, // 0 B01100000, // 1 B11011010, // 2 B11110010, // 3 B01100110, // 4 B10110110, // 5 B00111110, // 6 B11100000, // 7 B11111110, // 8 B11100110, // 9 };

// pins for decimal point and each segment // dp,G,F,E,D,C,B,A const int segmentPins[8] = { 5,9,8,7,6,4,3,2};

void setup() { for(int i=0; i < 8; i++) { pinMode(segmentPins[i], OUTPUT); // set segment and DP pins to output } }

void loop() { for(int i=0; i <= 10; i++) { showDigit(i); delay(1000); } // the last value if i is 10 and this will turn the display off delay(2000); // pause two seconds with the display off }

// Displays a number from 0 through 9 on a 7-segment display // any value not within the range of 0-9 turns the display off void showDigit( int number) { boolean isBitSet;

for(int segment = 1; segment < 8; segment++) { if( number < 0 || number > 9){ isBitSet = 0; // turn off all segments } else{ // isBitSet will be true if given bit is 1 isBitSet = bitRead(numeral[number], segment); } isBitSet = ! isBitSet; // remove this line if common cathode display digitalWrite( segmentPins[segment], isBitSet); } }

const byte numeral[10] = {
  //ABCDEFG /dp
  B11111100,  // 0
  B01100000,  // 1
  B11011010,  // 2
  B11110010,  // 3
  B01100110,  // 4
  B10110110,  // 5
  B00111110,  // 6
  B11100000,  // 7
  B11111110,  // 8
  B11100110,  // 9
};

// pins for decimal point and each segment
//                          dp,G,F,E,D,C,B,A
const int segmentPins[8] = { 5,9,8,7,6,4,3,2};

void setup()
{
  for(int i=0; i < 8; i++)
  {
    pinMode(segmentPins[i], OUTPUT); // set segment and DP pins to output
  }
}


void loop()
{
  for(int i=0; i <= 10; i++)
  {
    showDigit(i);
    delay(1000);
  }
  // the last value if i is 10 and this will turn the display off
  delay(2000);  // pause two seconds with the display off
}

// Displays a number from 0 through 9 on a 7-segment display
// any value not within the range of 0-9 turns the display off
void showDigit( int number)
{
  boolean isBitSet;

  for(int segment = 1; segment < 8; segment++)
  {
    if( number < 0 || number > 9){
      isBitSet = 0;   // turn off all segments
    }
    else{
      // isBitSet will be true if given bit is 1
      isBitSet = bitRead(numeral[number], segment);
    }
    isBitSet = ! isBitSet; // remove this line if common cathode display
    digitalWrite( segmentPins[segment], isBitSet);
  }
}