### Function

# GLib ascii_strtod

since: 2.0

#### Declaration

    gdouble
    g_ascii_strtod (
      const gchar* nptr,
      gchar** endptr
    )

#### Description

Converts a string to a floating point value.

This function behaves like the standard `strtod()` function does in the C locale. It does this without actually changing the current locale, since that would not be thread-safe. A limitation of the implementation is that this function will still accept localized versions of infinities and NANs.

This function is typically used when reading configuration files or other non-user input that should be locale independent. To handle input from the user you should normally use the locale-sensitive system `strtod()` function.

To convert from a gdouble to a string in a locale-insensitive way, use `g_ascii_dtostr()`.

If the correct value would cause overflow, plus or minus `HUGE_VAL` is returned (according to the sign of the value), and `ERANGE` is stored in `errno`. If the correct value would cause underflow, zero is returned and `ERANGE` is stored in `errno`.

This function resets `errno` before calling `strtod()` so that you can reliably detect overflow and underflow.

Available since: 2.0

#### Parameters

`nptr`

  Type: `const gchar*`

  The string to convert to a numeric value.

  The data is owned by the caller of the function.
  The value is a NUL terminated UTF-8 string.

`endptr`

  Type: `gchar**`

  If non-`NULL`, it returns the character after the last character used in the conversion.

  The argument will be set by the function.
  The argument can be `NULL`.
  The data is owned by the function.
  The value is a NUL terminated UTF-8 string.

#### Return value

Type: `gdouble`

The converted value.