From a573e445936a9f04e3a3a46dc15fd4f4b4d99b46 Mon Sep 17 00:00:00 2001
From: yuanqian52 <1229887109@qq.com>
Date: Mon, 19 Jul 2021 00:07:38 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0CHANGELOG=20=E5=B7=B2?=
 =?UTF-8?q?=E5=88=A0=E9=99=A4ass.ass?=
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---
 CHANGELOG | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 ass.ass   |  18 -----
 2 files changed, 193 insertions(+), 18 deletions(-)
 delete mode 100644 ass.ass

diff --git a/CHANGELOG b/CHANGELOG
index 81cb714..b57dc2e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,2 +1,195 @@
 2021.7.7 create the project
+chapter 1
+///关于变量
+fn main()
+{
+    let x = 13;//由rust本身进行推断
+    let mut x = 13;//当使用 mut 为关键字时,变量x为可变的
+    println!("{}",x);
+
+    let x:f64 = 3.14159;//给出声明和定义
+    println!("{}");
+
+    let x；//很少使用
+    x = 0;
+    println("{}",x);
+}
+
+///关于基本类型:
+  bool型；true false;
+  无符号整型：u８~u128;
+  有符号整型：i８~i128;
+  指针大小的整型：usize isize;
+  浮点数：f32 f64;
+  元组：t = (value,value,...) 取值时t.0 t.1 ...;
+  数组：相同类型数据元素的固定长度集合,[T,N]中，
+  　　　T是元素的类型，
+  　　　N是编译时已知的固定长度
+  
+  str:
+fn main()
+{
+    let a1 = 12; //默认i32
+    let a2 = 12u8; //
+    let b1 = 4.3; //默认f64
+    let b2 = 4.3f32; //
+    let br = true; //
+    let t = (13,false); //元组
+    let sentence = "hello world!"; //
+    let nums: [i32;3] = [1,2,3];//println!("{:?},nums); ->[1,2,3]
+                                //println!("{}",nums[1]); -> 2
+
+    fn zhuanhuan() ///关键字　as 起作用
+    {
+    　 　let a = 13u8;
+        let b = 7u32;
+        let c = a as u32 + b;
+        println!("{}", c);
+
+        let t = true;
+        println!("{}", t as u8);
+}
+} 
+
+///关于常量
+  起名遵循全大写蛇形命名法(SCREAMING_SNAKE_CASE)
+｛
+    const PI: f32 = 3.14159;
+
+    fn main() 
+    {
+        println!("make an apple {} from scratch.",PI);
+    }
+｝
+
+///关于函数(类似于ｃ语言)
+    //函数名遵循蛇形命名法(snake_case)
+    {
+        fn add(x:i32,y:i32) -> i32
+        {
+            return x+y;
+        }
+        fn main()
+        {
+            println!("{}",add(42,13));
+        }
+    }
+    //通过元组来实现多个返回值
+    {
+        fn swap(x: i32, y: i32) -> (i32, i32) 
+        {
+            return (y, x);
+        }
+
+        fn main()
+        {
+            let result = swap(123, 321);
+            println!("{} {}", result.0, result.1);
+
+            let (a, b) = swap(result.0, result.1);
+            println!("{} {}", a, b);
+        }
+    }
+    //通过返回空的元组来返回空值，即()
+    {
+        fn make_nothing1() -> () 
+        {
+        return ();
+        }
+
+        fn make_nothing2() 
+        {
+        }
+
+        fn main()
+        {
+            let a = make_nothing1();
+            let b = make_nothing2();
+
+            println!("The value of a: {:?}", a);
+            println!("The value of b: {:?}", b);  
+        }
+        //不论函数中是否规定返回值，最终输出结果都是()
+    }
+
+chapter 2 分支控制
+///if/else if/else
+  与ｃ语言相区别，判断条件不需要括号
+  if x < 42{...}else if x == 42{...}
+
+///循环
+  //break和loop
+{
+    fn main()
+    {
+        let mut x = 0;
+        loop
+        {
+            x += 1;
+            if x == 42
+            {
+                break;
+            }
+        }
+        println!("{}",x);
+    }
+}
+
+  //while:向循环添加条件
+{
+    fn main()
+    {
+        let mut x = 0;
+        while x != 42;
+        {
+            x += 1;
+        }
+    }
+}
+
+ ***//for:
+           //.. 运算符创建一个可以生成包含起始数字、但不包含末尾数字的数字序列的迭代器。
+           //..=运算符创建一个可以生成包含起始数字、且包含末尾数字的数字序列的迭代器。
+{
+    fn main()
+    {
+        for x in 0..5
+        {
+            println!("{}",x); -> 0 1 2 3 4 
+        }
+        for x in 0..=5
+        {
+            println!("{}",x); -> 0 1 2 3 4 5
+        }
+    }
+}
+
+  //match:类比于ｃ语言中的switch
+{
+    fn main()
+    {
+        let x = 42;
+
+        match x
+        {
+            //匹配值
+            0 => {println!("found zero");}
+            1 | 2 => {println!("found 1 or 2");} 
+            //匹配迭代器
+            3..=9 => {println!("found 3 to 9");} 
+            //将匹配数值绑定到变量
+            matched_num @ 10..=100 => {println!(found {} number between 10 to 100!",matched_num);} 
+            //默认匹配，在没有处理所有情况时，必须存在该匹配
+            _ => {println!("found something else!")}
+        }
+    }
+    //结果为　-> found 42 number between 10 to 100!
+}
+  
+  //从循环中返回值
+  　loop可以被中断以返回一个值。
+{
+    
+}
+
 
diff --git a/ass.ass b/ass.ass
deleted file mode 100644
index 11dd78a..0000000
--- a/ass.ass
+++ /dev/null
@@ -1,18 +0,0 @@
-butt
-爱仕达我的啊我dA
-ａ　ｄａ　ｓ　
-
-
-挨打的
-
-ｓｇｒ　　ｓ
-
-
-ａｓｄａｓｄａｓｄａｓｄ
-ａｓｄａｓｄａｓｄａｓｄｗ
-
-ｒ
-ｒ
-２
-
-ｘｄｓｆｄｆ　
-- 
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