The Map Data Structure
Now that you understand the basics, it’s time to move on to more exciting challenges. Let’s write a real program—something nontrivial but still simple enough to master this early in the book. Your task is to write a program that reads words and counts the frequency of each unique word. For the sake of simplicity, a word is a string of non-space characters separated by white space. Be aware, however, that by this definition, words end up including punctuation characters, but we’ll worry about fixing that problem later.
This is a complicated program, touching on everything you’ve learned about C++ so far. If ...