Why do we have functions?

A function is a way for programmers to reuse code without having to retype the code.

This is a big time saver, and it makes code more readable, that is if the function names are well selected.

For my example I will use

• returntype = void
  • This returntype specifies that the block of code will not return any value. Calling such a function will simply execute all the code in the function body. A return statement is redundant, as a return is implied by the closing curly bracked.
• functionName = FlashLED
  • The name describes the action the function does. Running this function will make the LED flash.
• function body
  • This is where the code for my function is.
• arguments = no argument, void

returntype functionName( arguments ){
  //function body
  return returntype;
}

{

  //function body
  digitalWrite(ledPin, HIGH);   
  delay(1000);                  
  digitalWrite(ledPin, LOW);    
  delay(1000);                  

  //return returntype;
  //implied by closing curly bracked
}