SteveLauC

$ neofetch
       _,met$$$$$gg.          steve@debian
    ,g$$$$$$$$$$$$$$$P.       ------------
  ,g$$P"     """Y$$.".        OS: Debian GNU/Linux 12 (bookworm) x86_64
 ,$$P'              `$$$.     Kernel: 6.1.0-15-amd64
',$$P       ,ggs.     `$$b:   Uptime: 1 day, 5 hours, 34 mins
`d$$'     ,$P"'   .    $$$    Packages: 1807 (dpkg), 22 (flatpak)
 $$P      d$'     ,    $$P    Shell: zsh 5.9
 $$:      $$.   -    ,d$$'    Resolution: 3440x1440
 $$;      Y$b._   _,d$P'      DE: GNOME 43.9

SteveLauC

fn main() {
    println!("Hello World!");
}

SteveLauC

fn map_using_if<T, U, F>(s: Option<T>, f: F) -> Option<U>
where
    F: FnOnce(T) -> U,
{
    if let Some(item) = s {
        Some(f(item))
    } else {
        None
    }
}

SteveLauC

REGEDIT4

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\FontLink\SystemLink]
"Arial"="wqy-microhei.ttc"
"Arial Black"="wqy-microhei.ttc"
"Arial CE,238"="wqy-microhei.ttc"
"Arial CYR,204"="wqy-microhei.ttc"
"Arial Greek,161"="wqy-microhei.ttc"
"Arial TUR,162"="wqy-microhei.ttc"
"Courier New"="wqy-microhei.ttc"

SteveLauC

# execute the following script in your terminal

echo "set -sg escape-time 0" >> ~/.tmux.conf
tmux source-file ~/.tmux.conf

SteveLauC

#Put it in the file '$home /. Cargo / config'
[source.crates-io]
registry = "https://github.com/rust-lang/crates.io-index"

#Replace it with your preferred mirror source
replace-with = 'sjtu'
#replace-with = 'ustc'

#Tsinghua University
[source.tuna]

SteveLauC

use std::io::{Read, stdin};

/*
    return: Some(char) on success, None on EOF or error.
*/
fn read_char() -> Option<char> {
    stdin().bytes().next().and_then(|res| res.ok()).map(|c| {
        char::from(c)
    })
}

SteveLauC

/*
 * signed int addition overflow test
 * exit(EXIT_FAILURE) if result overflows
 * print the correct value if everything is good.
*/

#include <stdio.h>
#include <stdlib.h>

int add(int x, int y) {