if (f_in); std::ifstream == int NULL); You could rewrite this as this: if (f_in) ; std::ifstream == int NULL); And you can see that this doesn’t really make sense. Maybe you meant: if (!f_in) { fprintf(stderr, “Can’t open input file in.list!\n”); exit(1); } Or if (f_in == NULL) { fprintf(stderr, “Can’t open input file in.list!\n”); … Read more
public static void createTextFileFromArrayList() { List<String> cities = new ArrayList<String>(); cities.addAll(Arrays.asList(“Boston”, “Washington”, “Irving”, “Dallas”)); //Get the file reference Path path = Paths.get(“C:\\apps\\output.txt”); //Use try-with-resource to get auto-closeable writer instance try (BufferedWriter writer = Files.newBufferedWriter(path)) { cities.forEach(city -> { try { writer.write(city); writer.write(“\n”); } catch (IOException e) { e.printStackTrace(); } }); } catch (IOException e) { … Read more