private void readFlag(String flag) {
		
		switch (flag) {
		case "lex":
			flagLexerOutput = true;
			break;
		case "par":
			flagParserOutput = true;
			break;
		case "genc":
			flagGeneratedCOutput = true;
			break;
			
		default:
			System.out.println("Error -" + flag + " is an unrecognised flag");
			break;
		}
	}