You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: printf.rs
    path of file: ./repos/Theseus/tlibc/src/stdio
    
    the code of the file until where you have to start completion: use crate::io::{self, Write};
use alloc::{
    collections::BTreeMap,
    string::{String, ToString},
    vec::Vec,
    format,
};
use libc::{c_char, c_short, c_int, c_long, c_longlong, intmax_t, ptrdiff_t, size_t, wchar_t, c_uchar, c_uint, c_u
    
fn float_exp(mut float: c_double) -> (c_double, isize) {
    let mut exp: isize = 0;
    while abs(float) >= 10.0 {
        float /= 10.0;
        exp += 1;
    }
    while f64::EPSILON < abs(float) && abs(float) < 1.0 {
        float *= 10.0;
        exp -= 1;
    }
    (float, exp)
}