Double to Const Char*

Question

How can I convert a double into a const char, and then convert it back into a double?

I\'m wanting to convert the double to a string, to write it to a file via fput

Answer 1

You can use these functions to convert to and from:

template 
bool convertFromStr(string &str, T *var) {
  istringstream ss(str);
  return (ss >> *var);
}

template 
string convertToStr(T *var) {
  ostringstream ss;
  ss << *var;
  return ss.str();
}

Example:

double d = 1.234567;
string str = convertToStr(&d);
cout << str << endl;
double d2;
convertFromStr(str, &d2);
cout << d2 << endl;