Question

I’m obviously not quite getting the ‘end-of-file’ concept with C++ as the below program just isn’t getting past the “while (cin >> x)” step. Whenever I run it from the command line it just sits there mocking me.

Searching through SO and other places gives a lot of mention to hitting ctrl-z then hitting enter to put through an end-of-file character on windows, but that doesn’t seem to be working for me. That makes me assume my problem is elsewhere. Maybe defining x as a string is my mistake? Any suggestions about where I’m going wrong here would be great.

Note: sorry for the lack of comments in the code – the program itself is supposed to take in a series of
words and then spit back out the count for each word.

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <iomanip>

using std::cin;
using std::cout;            using std::endl;
using std::sort;
using std::string;          using std::vector;

int main()
{
    cout << "Enter a series of words separated by spaces, "
            "followed by end-of-file: ";

    vector<string> wordList;
    string x;
    while (cin >> x)
          wordList.push_back(x);

    typedef vector<string>::size_type vec_sz;
    vec_sz size = wordList.size();
    if (size == 0) {
       cout << endl << "This list appears empty.  "
                       "Please try again."  << endl;
       return 1;
    }

    sort(wordList.begin(), wordList.end());

    cout << "Your word count is as follows:" << endl;
    int wordCount = 1;
    for (int i = 0; i != size; i++) {
        if (wordList[i] == wordList[i+1]) {
           wordCount++;
           }
        else {
             cout << wordList[i] << "    " << wordCount << endl;
             wordCount = 1;
             }
         }
    return 0;
}

Answer 1

If you’re on windows ^Z has to come as the first character after a newline, if you’re on a unixy shell then you want to type ^D.