Arrays.

An array is a list of data. Each piece of data in an array is identified by an index number representing its position in the array. Arrays are zero based, which means that the first element in the array is [0], the second element is [1], and so on. In this example, three arrays are created "array" "numbers" and "floats" filled with char, int and float values. This data is displayed on the Wiring console.

char array[20];
int numbers[20];
float floats[20];

void setup()
{
  for (int i = 0; i < 20; i++)
  {
    // fill "array" array with lower case characters starting woith the 'a'
    array[i] = 'a' + i;
    // fill the "numbers" array with integers
    numbers[i] = i;
    // fill the "floats" array with floating point numbers
    floats[i] = float(i);
  }

  Serial.begin(9600);

  for (int i = 0; i < 20; i++) // print array
  {
    Serial.print(array[i]);
    Serial.print(" ");
  }
  Serial.println();

  for (int i = 0; i < 20; i++) // print numbers
  {
    Serial.print(numbers[i], DEC);
    Serial.print(" ");
  }
  Serial.println();

  for (int i = 0; i < 20; i++) // print floats
  {
    Serial.print(floats[i]);
    Serial.print(" ");
  }
}

void loop()
{
}