Check out example codes for "double to string c++". It will help you in understanding the concepts better.

Code Example 1

// to_string example
#include <iostream>   // std::cout
#include <string>     // std::string, std::to_string

int main ()
{
  std::string pi = "pi is " + std::to_string(3.1415926);
  std::string perfect = std::to_string(1+2+4+7+14) + " is a perfect number";
  std::cout << pi << '\n';
  std::cout << perfect << '\n';
  return 0;
}

Code Example 2

std::ostringstream strs;
strs << dbl;
std::string str = strs.str();

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