C++ primer 5th Ed: The Word Transformation Program

Question

On chapter 11 from C++ Primer 5 Edition, the title "The Word Transformation Program" it has a function called word_transform() which is defined this way:

void word_transform(ifstream &map_file, ifstream &input)
{
    auto trans_map = buildMap(map_file); // store the transformations
    string text; // hold each line from the input
    while (getline(input, text)) { // read a line of input
        istringstream stream(text); // read each word
        string word;
        bool firstword = true; // controls whether a space is
        printed
            while (stream >> word) {
                if (firstword)
                    firstword = false;
                else
                    cout << " "; // print a space between words
                                 // transform returns its first argument or its transformation
                cout << transform(word, trans_map); // print the output
            }
        cout << endl; // done with this line of input
    }
}

• What I see if I am not wrong that the Boolean object firstword is redundant here and there's no need to check for a space and instead simply after calling transform_word which returns either a transformed text or original one then print it and simply print a space after it:

  void word_transform(ifstream &map_file, ifstream &input)
  {
      auto trans_map = buildMap(map_file); // store the transformations
      string text; // hold each line from the input
      while (getline(input, text)) { // read a line of input
          istringstream stream(text); // read each word
          string word;
  
          while (stream >> word)
              cout << transform(word, trans_map) << " ";
          cout << endl; // done with this line of input
      }
  }
  

• As you can see the function works fine. Please help whether I am correct or use the book's function.

Answer 1

Sure, your way prints all the transform(word, trans_map) separated by spaces. But you also print a redundant space at the end, which may or may not be of concern.