如何将字符转换为字符串? [英] How can I convert char to string?

问题描述

这个问题与 Rust 的预发布版本有关.这个年轻的问题类似.

This question pertains to a pre-release version of Rust. This younger question is similar.

---

我试图用 println 打印一个符号:

fn main() {
    println!('c');
}

但我遇到了下一个错误:

But I got next error:

$ rustc pdst.rs
pdst.rs:2:16: 2:19 error: mismatched types: expected `&str` but found `char` (expected &str but found char)
pdst.rs:2     println!('c');
                          ^~~
error: aborting due to previous error

如何将字符转换为字符串?

How do I convert char to string?

直接类型转换不起作用:

Direct typecast does not work:

let text:str = 'c';
let text:&str = 'c';

它返回:

pdst.rs:7:13: 7:16 error: bare `str` is not a type
pdst.rs:7     let text:str = 'c';
                       ^~~
pdst.rs:7:19: 7:22 error: mismatched types: expected `~str` but found `char` (expected ~str but found char)
pdst.rs:7     let text:str = 'c';
                             ^~~
pdst.rs:8:20: 8:23 error: mismatched types: expected `&str` but found `char` (expected &str but found char)
pdst.rs:8     let text:&str = 'c';
                                  ^~~

推荐答案

使用 char::to_string，即 来自 ToString 特性:

Use char::to_string, which is from the ToString trait:

fn main() {
    let string = 'c'.to_string();
    // or
    println!("{}", 'c');
}

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