From b648a6d7bed85e9c5d3b2da215ba49562e536dd8 Mon Sep 17 00:00:00 2001 From: ehlxr Date: Mon, 24 Aug 2020 18:10:10 +0800 Subject: [PATCH] update at 2020-08-24 18:10:10 by ehlxr --- src/main.rs | 47 +++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 39 insertions(+), 8 deletions(-) diff --git a/src/main.rs b/src/main.rs index e119025..48e388a 100644 --- a/src/main.rs +++ b/src/main.rs @@ -238,6 +238,8 @@ fn main() { reply: false, retweet: false, }; + println!("{}", t.to_string()); + let t1 = returns_summarizable(); println!("{}", notify(&t, &t1)); @@ -247,7 +249,7 @@ fn main() { println!("The largest number is {}", result); let char_list = vec!['y', 'm', 'a', 'q']; - let result = largest(&char_list); + let result = largest2(&char_list); println!("The largest char is {}", result); // --------------------------- @@ -1104,6 +1106,8 @@ fn add_to_count(inc: u32) { } } +use core::fmt; +use std::fmt::Formatter; use std::io::Read; use std::slice; @@ -1372,9 +1376,19 @@ impl Summary for Tweet { } } -impl ToString for Tweet { - fn to_string(&self) -> String { - format!("{:?}", self) +// impl ToString for Tweet { +// fn to_string(&self) -> String { +// format!("{:?}", self) +// } +// } + +impl Display for Tweet { + fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result { + write!( + f, + "Tweet username: {}, content: {}", + self.username, self.content + ) } } @@ -1417,10 +1431,22 @@ fn largest(list: &[T]) -> T { } // for item in list.iter() { - // if *item > largest { - // largest = *item; - // } - // } + // if *item > largest { + // largest = *item; + // } + // } + + return largest; +} + +fn largest2(list: &[T]) -> &T { + let mut largest = &list[0]; + + for item in list.iter() { + if item > largest { + largest = item; + } + } return largest; } @@ -1560,6 +1586,11 @@ impl Iterator for Counter { #[cfg(test)] mod tests { + #[test] + fn it_works() { + assert_eq!(2 + 2, 4); + } + use super::*; #[test]