protected static Ptg calcN( Ptg[] operands )
	{
		Object o = operands[0].getValue();
		if( (o instanceof Double) || (o instanceof Integer) || (o instanceof Float) || (o instanceof Long) )
		{
			Double d = new Double( o.toString() );
			return new PtgNumber( d );
		}
		if( o instanceof Boolean )
		{
			Boolean b = (Boolean) o;
			boolean bo = b;
			if( bo )
			{
				return new PtgInt( 1 );
			}
		}
		return new PtgInt( 0 );
	}