03 Variables

Arrays

An array is a collection of variables that are accessed with an index number. Arrays in the C programming language, on which Arduino is based, can be complicated, but using simple arrays is relatively straightforward.

// Declare an array of a given length without initializing the values:

int myInts[6];

// Declare an array without explicitly choosing a size (the compiler

// counts the elements and creates an array of the appropriate size):

int myPins[] = {2, 4, 8, 3, 6, 4};

// Declare an array of a given length and initialize its values:

int mySensVals[5] = {2, 4, -8, 3, 2};

// When declaring an array of type char, you'll need to make it longer

// by one element to hold the required the null termination character:

char message[6] = "hello";