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How to transform Vector into String?

  • Difficulty Level : Medium
  • Last Updated : 06 Jul, 2017

Vectors: Vectors are same as dynamic arrays with the ability to resize itself automatically when an element is inserted or deleted, with their storage being handled automatically by the container. C++ program to transform vector into string.
String: C++ has in its definition a way to represent sequence of characters as an object of class. This class is called std:: string.

std::ostringstream: It is an Output stream class to operate on strings. Objects of this class use a string buffer that contains a sequence of characters. This sequence of characters can be accessed directly as a string object, using member str.

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// C++ program transform a vector into
// a string.
#include <vector>
#include <string>
#include <algorithm>
#include <sstream>
#include <iterator>
#include <iostream>
  
int main()
{
  std::vector<int> vec;
  vec.push_back(1);
  vec.push_back(2);
  vec.push_back(3);
  vec.push_back(4);
  vec.push_back(5);
  vec.push_back(6);
  
  std::ostringstream vts;
  
  if (!vec.empty())
  {
    // Convert all but the last element to avoid a trailing ","
    std::copy(vec.begin(), vec.end()-1,
        std::ostream_iterator<int>(vts, ", "));
  
    // Now add the last element with no delimiter
    vts << vec.back();
  }
  
  std::cout << vts.str() << std::endl;
}

Output:

1, 2, 3, 4, 5, 6

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