Initial commit

.gitignore

+/target

Cargo.lock

+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "trafficlight"
+version = "0.1.0"

Cargo.toml

+[package]
+name = "trafficlight"
+version = "0.1.0"
+authors = ["邢兆忠 <zhaozhong.xing@hrtuoyu.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

+use std::io;
+
+struct Traffic{}
+/**
+ * 
+ */
+struct Area{
+    shape_type: String,
+    shape_base:  f32,
+    shape_height: f32,
+}
+fn main() {
+    //交通信号灯
+    let light = Traffic{};
+    for _ in 0..2 {
+        let mut input = String::new();
+        io::stdin().read_line(&mut input).expect("failed to read line");
+        // print!("{:?}", input);
+        println!("{} light is {}s",input.trim(),  light.light_time(input.to_string()));
+    }
+    // println!("{} light is {}s",input.to_string(),  light.light_time("red"));
+    //定义整数集合
+    let number_list = &[30, 50, 78, 96];
+    //整数求和
+    let result = sum_u32(number_list);
+    //println!("number_list sum is {}", result);
+    // match result {
+    //     // The division was valid
+    //     Some(x) => println!("Result: {}", x),
+    //     // The division was invalid
+    //     None    => println!("Cannot sum")
+    // }
+    println!("{:?}", result);
+
+    let area = Area{
+        shape_type:String::from("三角形"),
+        shape_base:  3.0,
+        shape_height: 5.0,
+    };
+    println!("{}------------{}", area.shape_type, calculate(&area));
+}
+
+trait TrafficLight{
+    fn light_time(&self, _type : String)->u8;
+}
+
+/**
+ * 交通信号灯
+ */
+impl TrafficLight for Traffic{
+    fn light_time(&self, _type : String) ->u8{
+        // println!("light type {}",  _type == "red\n");
+        if _type == "red\n" {
+            60
+        }else if _type == "green\n" {
+            10
+        }else if _type == "yellow\n"{
+            20
+        }else{
+            0
+        }
+    }
+}
+
+/**
+ * 整数求和
+ * */
+fn sum_u32(list:&[u32])->Option<u32>{
+    let len = list.len();
+    let mut sum_u32 = 0;
+    if len== 0 {
+        None
+    } else {
+        for item in list {
+            sum_u32 += item;
+        }
+        Some(sum_u32)
+    }
+}
+
+
+pub trait MultArea{
+    fn mult (&self)->f32;
+}
+
+impl MultArea for Area{
+    fn mult(&self)->f32{
+        if self.shape_type == "正方形" {//正方形
+            self.shape_base * self.shape_height
+        }else  if self.shape_type == "圆形" {//圆形
+            self.shape_base * self.shape_height * 3.14
+        }else  if self.shape_type == "三角形" {//三角形
+            self.shape_base * self.shape_height / 2.0
+        }else{
+            0.0
+        }
+    }
+}
+
+pub fn calculate<T: MultArea> (item: &T)->f32{
+    item.mult()
+}
+
+