C++ convert from 1 char to string?

I need to cast only 1 char to string. The opposite way is pretty simple like str[0].

The following did not work for me:

char c = 34;
string(1,c);
//this doesn't work, the string is always empty.

string s(c);
//also doesn't work.

boost::lexical_cast<string>((int)c);
//also doesn't work.

All of

std::string s(1, c); std::cout << s << std::endl;

and

std::cout << std::string(1, c) << std::endl;

and

std::string s; s.push_back(c); std::cout << s << std::endl;

worked for me.

I honestly thought that the casting method would work fine. Since it doesn't you can try stringstream. An example is below:

#include <sstream>
#include <string>
std::stringstream ss;
std::string target;
char mychar = 'a';
ss << mychar;
ss >> target;

This solution will work regardless of the number of char variables you have:

char c1 = 'z';
char c2 = 'w';
std::string s1{c1};
std::string s12{c1, c2};

You can set a string equal to a char.

#include <iostream>
#include <string>

using namespace std;

int main()
{
   string s;
   char one = '1';
   char two = '2';
   s = one;
   s += two;
   cout << s << endl;
}

>./test
12