How do you convert a vector of integers to a delimited string in C ?

Join Vector of Integers into a Delimited String

In C , converting a vector of integers into a string delimited by a specific character can be achieved through various approaches.

Using a Stringstream

One method involves using a std::stringstream, as shown in the following code:

<code class="cpp">#include <sstream>
//...

std::stringstream ss;
for (size_t i = 0; i < v.size(); ++i) {
  if (i != 0)
    ss << ",";
  ss << v[i];
}
std::string s = ss.str();

Here, the stringstream object ss is used to sequentially append the integers to the string while inserting a comma as the delimiter.

Utilizing std::for_each

Alternatively, you can use the std::for_each algorithm along with a custom lambda function:

<code class="cpp">#include <algorithm>
#include <sstream>
//...

std::stringstream ss;
std::for_each(v.begin(), v.end(), [&ss](int i) {
  if (ss.str().size() != 0)
    ss << ",";
  ss << i;
});
std::string s = ss.str();</code>

In this approach, the lambda function inserts a comma when iterating over subsequent elements, ensuring the correct delimiter placement.

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