Rust examples

println!("Hello World!")

fn main() {
    let s = sum(1, 2);
    println!("The sum of 1, 2 is {}", s);
}

fn sum(n1: i32, n2: i32) -> i32 {
    n1 + n2
}

pub trait Summary {
    fn summarize(&self) -> String;
}

pub struct Tweet {
    pub username: String,
    pub content: String,
}

impl Summary for Tweet {
    fn summarize(&self) -> String {
        format!("{} {}", self.username, self.content)
    }
}

let tweet = Tweet {
    username: String::from("nerding_it"),
    content: String::from("Hello Twitter!"),
};

println!("New tweet: {}", tweet.summarize());

struct User {
    name: String,
};

let user = User {
    name: String::from("John"),
};

println!("Hello {}", user.name);

let i = 1;
if (i > 0) {
    println!("Greater than 1");
}
else {
    println!("Less than 1")
}

let mut count = 0;
loop {
    println!("Count is {}", count);
    count += 1;
    if count == 5 {
        break;
    }
}

use std::process::Command;

fn main() {
    let output = Command::new("rustc")
        .arg("--version")
        .output().unwrap_or_else(|e| {
            panic!("failed to execute process: {}", e)
    });

    if output.status.success() {
        let s = String::from_utf8_lossy(&output.stdout);

        print!("rustc succeeded and stdout was:\n{}", s);
    } else {
        let s = String::from_utf8_lossy(&output.stderr);

        print!("rustc failed and stderr was:\n{}", s);
    }
}

let add = |n1: i32, n2: i32| -> i32 { n1 + n2};
println!("Add 1 2 is {}", add(1, 2));