std::numpunct::decimal_point,do_decimal_point (3) Linux Manual Page

std::numpunct<CharT>::decimal_point,do_decimal_point – std::numpunct<CharT>::decimal_point,do_decimal_point

Synopsis

Defined in header<locale>

    public : (1)

                 char_type decimal_point() const;

protected:
(2)

    virtual char_type do_decimal_point() const;

1) Public member function, calls the member function do_decimal_point of the most derived class.
2) Returns the character to be used as the decimal separator between integer and fractional parts.

Return value

The value of type char_type to use as the decimal separator. The standard specializations of std::numpunct return ‘.’ and L’.’.

Example

// Run this code

#include <iostream>

#include <locale>
struct slash : std::numpunct<char> {
    char do_decimal_point() const
    {
        return '/';
    } // separate with slash
};
int main()

{
    std::cout.precision(10);
    std::cout << "default locale: " << 1234.5678 << '\n';
    std::cout.imbue(std::locale(std::cout.getloc(), new slash));
    std::cout << "locale with modified numpunct: " << 1234.5678 << '\n';
}

Output:

  default locale: 1234.5678
  locale with modified numpunct: 1234/5678