From 285a5d6d95c7294dd235dd8975bcf79a2b7e44b5 Mon Sep 17 00:00:00 2001
From: lsrong <lsrong0414@gmail.com>
Date: Tue, 31 Oct 2023 23:11:06 +0800
Subject: [PATCH] =?UTF-8?q?=E6=89=93=E5=8D=B0=E4=B8=80=E4=B8=AA=E6=95=B0?=
 =?UTF-8?q?=E5=AD=97=E7=9A=8432=E4=BD=8D=20=E7=9A=84=E7=8A=B6=E6=80=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .gitignore                                 |  6 +++
 tyro/src/main/java/Code01_PrintBinary.java | 53 ++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 tyro/src/main/java/Code01_PrintBinary.java

diff --git a/.gitignore b/.gitignore
index 9154f4c..d1d1f59 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,4 +23,10 @@
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 replay_pid*
+**/mvnw
+**/mvnw.cmd
+**/.gitignore
+**/.mvn
+**/target
+.idea
 
diff --git a/tyro/src/main/java/Code01_PrintBinary.java b/tyro/src/main/java/Code01_PrintBinary.java
new file mode 100644
index 0000000..af9925a
--- /dev/null
+++ b/tyro/src/main/java/Code01_PrintBinary.java
@@ -0,0 +1,53 @@
+public class Code01_PrintBinary {
+
+    // << 左移运算-无论什么数字都是一样的操作逻辑，二进制整体左移，最左边用0来填充
+
+    /**
+     * 打印一个数字的32位 的状态
+     * @param num
+     */
+    public static void printBinary(int num){
+        for(int i = 31; i >= 0; i--){
+//            System.out.print((num & (1 << i)) == 0 ?"0":"1");
+            int a = num & (1 << i);     // 1 左移 i 位 10**0 然后在和num 与 位运算
+            System.out.print(a == 0 ? "0" : "1");
+        }
+        System.out.println();
+    }
+
+    public static void main(String[] args){
+        int num = 321312;
+        //printBinary(num);
+
+
+        // 有符号 ， 无符号
+        num = Integer.MAX_VALUE;
+//        printBinary(num);
+//        printBinary(-1);
+
+        int a = Integer.MIN_VALUE;  // 负数： 第一位为符号位，后面取反加1
+       // printBinary(a);
+
+        // 取反
+//        int b = 12345;
+//        int c = ~b;
+//        printBinary(b);
+//        printBinary(c);
+
+//        printBinary(-5);
+
+        // 负数最小值的数值并正数的大1 -2^32 ~ 2^32-1(忽略符号位)
+        System.out.println(Integer.MIN_VALUE);
+        System.out.println(Integer.MAX_VALUE);
+
+        int c = -5;
+        int d =-c;
+        d = (~c + 1);
+        System.out.println(c);
+        System.out.println(d);
+
+        int e = Integer.MIN_VALUE; // 负数最小为 本身， 取反加1 二进制就是本身
+        printBinary(e);
+        printBinary(-e);
+    }
+}