rust11.结构体

fn main() {
    //1.定义结构体
    struct User {
        name: String,
        count: String,
        nonce: u64,
        active: bool,
      }
    //2.创建结构体实例
    let xiaoming = User {
        name: String::from("Xiaoming"),
        count: String::from("80001000"),
        nonce: 10000,
        active: true,
      }; 
    //3.修改结构体字段
     let mut xiaohuang = User {
        name: String::from("Xiaohuang"),
        count: String::from("80001000"),
        nonce: 10000,
        active: true,
      }; 
     xiaohuang.nonce = 20000;
     //4.参数名字和字段名字同名的简写方法
     let name = String::from("xiaoxiao");
     let count = String::from("58398439");
     let nonce = 20000;
     let active = false;

    /*let user1 = User {
      name: name,
      count: count,
      nonce: nonce,
      active: active,
      };*/
     let user1 = User {
        name,
        count,
        nonce,
        active,
      };
     //5.从其它结构体创建实例
     let user2 =  User {
        //name: user1.name,
        name = String::from("user2"),
        ..user1
      };
      println!("name = {} ",user2.name);
     //6.元组结构体
     //字段没有名字，使用圆括号
     struct Point(i32,i32);
     
     let a = Point(1,10);
     let b = Point(3,11);

     println!("a.x = {}, a.y = {}",a.0,a.1);
     //7.没有任何字段的类单元结构体
     struct A{};
     //8.打印结构体
     #[derive(Debug)] //或者自行实现display特征
     println!("xiaoming = {:?}",xiaoming);
     println!("xiaoming = {:#?}",xiaoming);
  }