/**
* Adds a new positional argument to be parsed from the command line
*
* @param arg a new instance of a positional argument If a positional argument is not supplied,
* the program should exit, and the usage information should be displayed along with the error
* stating the missing argument. If an additional (i.e., one too many) positional argument is
* specified, then the program should exit, and the usage information should be displayed
* along with the error stating the additional argument.
*/
public void addPositionalArgument(PositionalArgument arg) {
posCount++;
arg.setPosition(posCount);
positionalArgumentList.add(arg);
}
