Rustのデータ型2

ブール値

fn main(){
	let t = true;
	let f: bool = false;

	println!("{} {}", t, f);
}

キャラクタ

fn main(){
	let c = 'z';
	let n:char = '0';
	let jp = 'あ';

	println!("{} {} {}", c, n, jp);
}

b’~’で囲んだASCII文字はバイト文字として扱われる
let chb = b’a’;
let ch = ‘a’;
let chjp = ‘あ’;

文字列
RustにはstrとStringの2種類がある。String型はプリミティブなデータ型ではない。strは文字列スライトという
let msg:&str = “Hello, Dogs!”;
let s = &msg[2..5];

fn main(){
	let msg:&str = "Hello, Dogs!";

	println!("msg.len()={}", msg.len());
	println!("msg={}", msg);
	println!("msg={}", &msg[2..5]);
}

fn main(){
	let dog = "ポチ";
	let msg = format!("{} ({}歳)", dog, 6);
	println!("{}", msg);
}

fn main(){
	let mut msg:String = String::from("Hello");
	msg = msg + " Rust!";

	println!("{}", msg);
}

push_str, insert_str, +がある

fn main(){
	let mut msg = String::from("ポチ");
	msg.push_str("Good Dog");

	println!("{}", msg);
}

fn main(){
	let mut s = String::from("ポチ");
	s.insert_str(0, "Hello");

	println!("{}", s);
}

fn main(){
	let mut msg = String::from("ポチ");
	msg = msg + "Good Dog";

	println!("{}", msg);
}