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CppDoubleToStr

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(C++) Converting a double to a std::string

When not using the Boost C++ Library

In analogy with the standard 'atof' function, doing the other way around:

(function taken from from Marshall Cline's C++ FAQ Lite document http://www.parashift.com/c++-faq-lite/)

include <sstream>

include <cassert>


std::string ftoa(const double& x)
{
  std::ostringstream o;
  if (!(o << x)) return "ERROR";
  return o.str();
}
int main()
{
  assert(ftoa("69.69")==69.69);
}

You could also use the Boost C++ Library's lexical_cast:

include <cassert>

include <string>

include <boost/lexical_cast.hpp>


int main()
{
  const double d = 123.456;
  const std::string s = boost::lexical_cast<std::string>(d);
  assert(s == "123.456");
}

Other code snippets

Topic links

• ::, scope operator
• #include
• assert
• char
• const
• double
• #include
• int
• main
• return
•  ?sstream
• std
• std::string
• string
• scope operator, ::
• return

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