From c17d7251831d203f0f9f86cc93be741827682167 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Wed, 24 Dec 2025 14:23:36 +0800
Subject: [PATCH] =?UTF-8?q?day03-if-=E4=B8=89=E7=A7=8D=E6=A0=BC=E5=BC=8F?=
 =?UTF-8?q?=E7=9A=84=E5=AD=A6=E4=B9=A0=E4=B8=8E=E7=BB=83=E4=B9=A0?=
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---
 day03/src/com/inmind/Demo01_if.java | 32 ++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/day03/src/com/inmind/Demo01_if.java b/day03/src/com/inmind/Demo01_if.java
index 7a72418..d67494f 100644
--- a/day03/src/com/inmind/Demo01_if.java
+++ b/day03/src/com/inmind/Demo01_if.java
@@ -51,12 +51,42 @@ else{
 
 */
 public class Demo01_if {
+    //if的格式三的练习
     public static void main(String[] args) {
+        int score =77;
+        if(score<0 || score>100){
+            System.out.println("你的成绩是错误的");
+        }else if(score>=90 && score<=100){
+            System.out.println("你的成绩属于优秀");
+        }else if(score>=80 && score<90){
+            System.out.println("你的成绩属于好");
+        }else if(score>=70 && score<80){
+            System.out.println("你的成绩属于良");
+        }else if(score>=60 && score<70){
+            System.out.println("你的成绩属于及格");
+        }else {
+            System.out.println("你的成绩属于不及格");
+        }
+    }
+
+    //if的格式三
+    public static void ifMethod3(String[] args) {
         // x和y的关系满足如下：
         // x>=3 y = 2x + 1;
         //-1<=x<3 y = 2x;
-        // x<=-1 y = 2x – 1;
+        // x<-1 y = 2x – 1;
         // 根据给定的x的值，计算出y的值并输出。
+        int x = -2;
+        int y;
+        if (x >= 3) {
+            y = 2*x + 1;
+        } else if (x>=-1 && x<3) {
+            y = 2*x;
+        } else {
+            y = 2*x-1;
+        }
+
+        System.out.println(y);
 
     }