rust学习(二)

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 1 #![allow(unused)]
 2 fn write_bar(size: u64){
 3     match size{
 4         o if o < 100 => println!("{:?} less than 100", o),
 5         o if o < 200 && o > 100  => println!("{:?} between 100-200", o),
 6         _ => println!("{:?} bigger than 200", size),
 7     }
 8 }
 9 fn main() {
10     write_bar(10);
11     write_bar(150);
12     write_bar(250);
13 }

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