Storing floats to a string?

Is it possible to do this?
I have tried something like this but it has not worked:

Code:

---

float x = 9;
float y = 33;

string sum = x;
sum += "+";
sum += y;

---

I would want the outcome to look like "9+33"

I know that seems dumb but I am actually trying something on a larger scale.
I know I could use:

Code:

---

cout << x << "+" << y

---

but I need to display this a lot so I would like it to be a string.

Thanks.

This topic has no doubt been covered already on these forums as well as google, but here is the answer anyway:

Code:

---

#include <string>
#include <sstream>
#include <exception>

std::string to_string(int x)
{
  std::ostringstream o;

  if (!(o << x))
    throw std::exception("Couldn't parse integer in to_string.");

  return o.str();
}

int main()
{
  std::string x = "12 * 12 = " + to_string(12 * 12);

  std::cout << x << std::endl;

  return 0;
}

---

There is also boost::lexical_cast, but if you are new to C++ it's easier to forget 3rd party libraries until you get more familiar with the language.

Faq: How to convert a numeric type to a string?

Thanks. I actually did search Google but for some reason found nothing.