C++ Populate a vector of strings from a space-delimited text file

Question

I have a space delimited text file, from which I need to extract individual words to populate a vector<string>.

I've tried playing around with strtok, but I understand this is not working because strtok returns a char pointer. Any way to extract the words from the file, and fill the string vector with them? Thanks!

[This answer](http://stackoverflow.com/a/237280/1336150) might help you too... — Eitan T, Jun 23 '12 at 01:57
possible duplicate of [How to read in space-delimited information from a file in c++](http://stackoverflow.com/questions/2530738/how-to-read-in-space-delimited-information-from-a-file-in-c) — Bo Persson, Jun 23 '12 at 02:09

score 5 · Accepted Answer · answered Jun 23 '12 at 01:53

5

There are "fancier" ways, but in my opinion the following's most understandable (and useful as a basis for variations) for beginners:

if (std::ifstream input(filename))
{
    std::vector<std::string> words;
    std::string word;
    while (input >> word)
        words.push_back(word);
}

answered Jun 23 '12 at 01:53

Tony Delroy

102,968
15
177
252

1

Just in case you're curious what's meant by fancier, `std::vector vec ((std::istream_iterator(in)), std::istream_iterator());`, where `in` is the `ifstream` object. – chris Jun 23 '12 at 02:01

score 2 · Answer 2 · edited Apr 11 '13 at 01:53

2

Consider using an ifstream to read the file.

Then you can use the >> operator to move the next word into the string.

edited Apr 11 '13 at 01:53

Shafik Yaghmour

154,301
39
440
740

answered Jun 23 '12 at 01:49

EvilTeach

28,120
21
85
141

C++ Populate a vector of strings from a space-delimited text file

2 Answers2