need help on splitting a string in c++

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Splitting a string in C++

i need a suggestion on how to take one string of text and split it up based on a certain character, in this case "," without the use of any outside libraries

the lines of text are:

Amadeus,Drama,160 Mins.,1984,14.83
As Good As It Gets,Drama,139 Mins.,1998,11.3
Batman,Action,126 Mins.,1989,10.15
Billy Elliot,Drama,111 Mins.,2001,10.23
BR,SF,117,1982,11.98
Shadowlands,Drama,133 Mins.,1993,9.89
Shrek,Animation,93 Mins,2001,15.99
Snatch,Action,103 Mins,2001,20.67
The Lord of the Rings,Fantasy,178 Mins,2001,25.87

While, it does say whitespace in the question, there is lots in here about delimiters and standard-only: [Splitting a string in C++](http://stackoverflow.com/questions/236129/splitting-a-string-in-c) — chris, Jan 13 '13 at 18:27
You know, this is actually a duplicate of one of the most viewed questions on SO. — Rapptz, Jan 13 '13 at 18:28
I hope this link helps! http://stackoverflow.com/questions/53849/how-do-i-tokenize-a-string-in-c — AAA, Jan 13 '13 at 18:29

score 1 · Answer 1 · answered Jan 13 '13 at 18:37

If you don't want to resort to other libraries (Boost.Tokenizer is a good choice IMO), here is some simple code for doing that:

#include <string>
#include <vector>

using namespace std;

vector<string> tokenize(string const& s, string const& separator)
{
    size_t start = 0;
    size_t pos = s.find(separator);

    vector<string> v;
    while (pos != string::npos)
    {
        string sub = s.substr(start, pos - start);
        v.push_back(sub);

        start = pos + 1;
        pos = s.find(separator, start);
    }

    string sub = s.substr(start, pos - start);
    v.push_back(sub);

    return v;
}

int main()
{
    string s = "asfa,adf,daf,c";
    vector<string> v = tokenize(s, ",");

    // Do what you want with v...

    return 0;
}

@RobertSpratlin: it compiles fine under GCC 4.7.2 and Clang 3.2. Are you compiling the whole example, or did you take out just the `tokenize()` function? if that's the case, did you include the `using namespace std` directive as well? also, did you `#include` the `` header? — Andy Prowl, Jan 13 '13 at 19:46
@RobertSpratlin: btw you spelled "sepErator" instead of "sepArator", not sure if you have the same typo in your program — Andy Prowl, Jan 13 '13 at 19:47

score 0 · Answer 2 · answered Jan 13 '13 at 18:29

0

You could just find the indices of the commas and store them in a vector, then use string::substr (http://www.cplusplus.com/reference/string/string/substr/) to get the substrings between those indices.

answered Jan 13 '13 at 18:29

jdesai927

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need help on splitting a string in c++

2 Answers2