Converting string into array of int c++

Question

I want to convert the string str = "12 13 15 20" into array of integers like int str_int[4]{12,13,15,20} using c++.

Create a `stringstream` from it and `while (stream >> val)` push it back on a `vector`. `-1` for lack of effort. — Bartek Banachewicz, May 16 '14 at 13:52
-1 (and close vote) for lack of effort. Consider doing a search on stack overflow. — utnapistim, May 16 '14 at 14:00

4pie0 · Answer 1 · 2016-05-03T17:59:43.867

2

You can use stringstream:

#include <iostream>
#include <sstream>
#include <vector>
#include <iterator>
#include <algorithm>
using namespace std;

int main()
{
    std::string s = "12 13 15 20";
    std::stringstream ss( s);

    int i;
    std::vector<int> v;

    while( ss >> i)
        v.push_back( i);

    std::copy( v.begin(), v.end(), 
                             std::ostream_iterator<int>( std::cout, ","));
    return 0;
}

Another option is:

std::copy( std::istream_iterator<int>( ss), std::istream_iterator<int>(),     
                                                   std::back_inserter(v));

edited May 03 '16 at 17:59

answered May 16 '14 at 13:58

4pie0

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`std::copy(std::istream_iterator(is), std::istream_iterator(), std::back_inserter(v));` would also work instead of the `while`... – Massa May 16 '14 at 14:25
yes, but this way is faster – 4pie0 May 16 '14 at 14:26
[[citation needed]] :D – Massa May 16 '14 at 14:27

Converting string into array of int c++

1 Answers1