Statements and Comments.

Statements are the elements that make up programs. The ";" (semi-colon) symbol is used to end statements. It is called the "statement terminator." Comments are used for making notes to help people better understand programs. A comment begins with two forward slashes ("//").

// The pinMode function is a statement that tells the Wiring board
// to set a pin as INPUT or OUTPUT.
// Each function statement has zero or more parameters.
// Parameters are data passed into the function
// and used as values for specifying what the hardware will do.

void setup()
{
  pinMode(WLED, OUTPUT);
  digitalWrite(WLED, HIGH);
}

// The digitalWrite function is a statement that tells the hardware
// which value to set a pin, HIGH or LOW

void loop()
{
  // nothing for loop()
}