Is there a built-in function that comma-separates a number in C, C++, or JavaScript? [closed]

Answer 1

For C++, you can try:

std::locale get_numpunct_locale(std::locale locale = std::locale(""))
{
#if defined(_MSC_VER) && defined(_ADDFAC) && (!defined(_CPPLIB_VER) || _CPPLIB_VER < 403)
    // Workaround for older implementations
    std::_ADDFAC(locale, new std::numpunct());
    return locale;
#else
    return std::locale(locale, new std::numpunct());
#endif
}

template
std::string nformat(T value)
{
    std::ostringstream ss;
    ss.imbue(get_numpunct_locale());
    ss << value;
    return ss.str();
}