Function core::num::flt2dec::digits_to_exp_str

fn digits_to_exp_str<'a>(buf: &'a [u8], exp: i16, min_ndigits: usize, upper: bool, parts: &'a mut [Part<'a>]) -> &'a [Part<'a>]

Unstable (flt2dec)

: internal routines only exposed for testing

Formats given decimal digits 0.<...buf...> * 10^exp into the exponential form with at least given number of significant digits. When upper is true, the exponent will be prefixed by E; otherwise that's e. The result is stored to the supplied parts array and a slice of written parts is returned.

min_digits can be less than the number of actual significant digits in buf; it will be ignored and full digits will be printed. It is only used to print additional zeroes after rendered digits. Thus min_digits of 0 means that it will only print given digits and nothing else.