小编ysK*_*nok的帖子

我怎么能从句子中得到第一个字母; 例如:"Rust是一种快速可靠的编程语言"应该返回输出riafrpl.

fn main() {
    let string: &'static str = "Rust is a fast reliable programming language";
    println!("First letters: {}", string);
}