Question

How to convert a double into a floating-point string representation without scientific notation in C++.
“Small” samples (effective numbers may be of any size, such as 1.5E200 or 1e-200) :

0.0000000000000000000000000000000000000000000000000000000023897356978234562

Thank you.

Answer 1

string doubleToStr(double d)
{
    stringstream ss;
    ss << fixed << setprecision(400) << d;
    return ss.str();

}