摘要: fn multiply(num: Option<usize>) -> usize { return num.unwrap_or(0) * 5; } fn multiply1(num: Option<usize>) -> Option<usize> { match num { Some(num) => 阅读全文
posted @ 2023-05-18 20:32 Zhentiw 阅读(27) 评论(0) 推荐(0)