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Parsing Arrays in C++An array can be defined as a data structure consisting of a group of elements. Basically, all these elements have the same data type, for example, a string or integer. Arrays are used in C++ and other programming languages to organize data or information, so that, values and var...

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Hash tables in Java

import java.io.File; import java.io.IOException; import java.util.*; import java.util.stream.Collectors; import java.util.stream.IntStream; public class SpellChecker { // Static collection for lowercase alphabet sybols private static final List alphabetic; static { alphabetic = new ArrayList<>(); for (char c = 'a'; c<= 'z'; c++) { alphabetic.add(c); } } // Map, containing seof misspellings for any word in dictionary private final Map> words; /** * SpellChecker constructor from given dictionary file * @param filename dictionary file * @throws IOException thrown, on file reading */ public SpellChecker(String filename) throws IOException { // create file scanner and reading line by line try(Scanner scanner = new Scanner(new File(filename))) { // create map words = new HashMap<>(); while (scanner.hasNextLine()) { // read line and put word's fuzzies to the map String word = scanner.nextLine().trim(); words.put(word, getFuzzy(word)); } } } /** * Method, providing possible correct version of misspelled word * @param word misspelled word * @return collection of possible dictionary words */ public CollectiongetSuggest(String word) { // if word matches any word in dictionary, return singleton collection if (words.containsKey(word)) return Collections.singleton(word); // Iterating over all words in dictionary, and collect any word, which contains current as a fuzzy Collection result = new ArrayList<>(); for(Map.Entry> pair : words.entrySet()) { if (pair.getValue().contains(word)) { result.add(pair.getKey()); } } return result; } /** * Generates collections of fuzzies for given word * @param word * @return */ private CollectiongetFuzzy(String word) { Collection fuzzies = new ArrayList<>(); // missing symbol fuzzy fuzzies.addAll( IntStream.range(0, word.length()) .mapToObj(i ->word.substring(0,i) + word.substring(i+1)) .collect(Collectors.toList())); // wrong symbol fuzzy fuzzies.addAll( IntStream.range(0, word.length()) .boxed() .flatMap(i ->alphabetic.stream() .map(c ->word.substring(0, i) + c + word.substring(i + 1))) .collect(Collectors.toList())); // inserted symbol fuzzy fuzzies.addAll( IntStream.range(0, word.length() + 1) .boxed() .flatMap(i ->alphabetic.stream() .map(c ->word.substring(0, i) + c + word.substring(i))) .collect(Collectors.toList())); // transposition fuzzy fuzzies.addAll( IntStream.range(0, word.length() - 1) .boxed() .flatMap(i ->alphabetic.stream() .map(c ->word.substring(0, i) + word.charAt(i+1) + word.charAt(i) + word.substring(i+2))) .collect(Collectors.toList())); return fuzzies; } public static void main(String[] args) throws IOException { // create spellChecker object SpellCheckersc = new SpellChecker("dictionary.txt"); // test word in lowercas String word = "erlevant"; word = word.toLowerCase(); // output possible choices. System.out.println(String.join(", ", sc.getSuggest(word))); } }

Java classes and objects

import java.util.Scanner; public class ChocolateCoupons { // Entry point of the program public static void main(String[] args) { Scanner in = new Scanner(System.in); // Ask the money of the user System.out.println("How much money can you spend on chocolate bars?"); int cash = in.nextInt(); // Calculate how many chocolate bars can be bought // Each choc costs $1 int numChocs = cash; // Each choc has a coupon int numCoupons = numChocs; // We use the coupons to buy another set of chos // 6 coupons is to 1 choc while (numCoupons>= 6) { numCoupons -= 6; numChocs += 1; // More coupon for each choc numCoupons++; } // Report the total number of chocs System.out.println("After redeeming coupons, you have " + numCoupons + " leftover coupons and can purchase a total of " + numChocs + " chocolate bars."); } }