function charCodeAt(index : Number) : String

function charCodeAtTest(n){
  var str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; //Initialize variable.
  var n;                                  //Declare variable.
  n = str.charCodeAt(n - 1);              //Get the Unicode value of the
                                          // character at position n.
  return(n);                              //Return the value.
}