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#[derive(Debug)]
struct Dog {
    name: String,
    weight: f32,
    height: f32,
  }
impl Dog {
    fn get_name(&self) -> &str {
        &(self.name[..])
      }
    fn get_height(&self) -> f32 {
        self.height
      }
    fn sound() {
        println!("wang-wang-wang!");
      }
  }
impl Dog {
    fn get_weight(&self) -> f32 {
        self.weight
      }
  }
fn main() {
    let dog = Dog {
        name: String::from("wangcai"),
        weight: 100.5,
        height: 70.5,
      };
    println!("dog = {:#?}",dog);
    println!("name = {}",dog.get_name());
    println!("weight = {}",dog.get_weight());

    Dog::show();
  }