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 fputs, and then when I read the file, it will need to be converted back into a double.

I'm using Visual C++ 2010 Express Edition.

Answer 1

If you just want to write the double values to file, you can simply write it, without converting them into const char*. Converting them into const char* is overkill.

Just use std::ofstream as:

 std::ofstream file("output.txt")'

 double d = 1.989089;

 file << d ; // d goes to the file!

 file.close(); //done!

Answer 2

Since you added C++ to your tags, I suggest you use std::stringstream:

#include <sstream>

stringstream ss;
ss << myDouble;
const char* str = ss.str().c_str();
ss >> myOtherDouble;