diff --git a/day03/src/com/inmind/Demo04_while.java b/day03/src/com/inmind/Demo04_while.java
index 71a8158..ec83280 100644
--- a/day03/src/com/inmind/Demo04_while.java
+++ b/day03/src/com/inmind/Demo04_while.java
@@ -13,6 +13,20 @@ while(循环条件②){
 public class Demo04_while {
     public static void main(String[] args) {
         //使用while的语法，计算出1~100的偶数累和
+        //定义一个变量记录总和
+        int sum = 0;
+        //循环变量的定义
+        int i = 1;
+        while (i <= 100) {
+            //判断是否是偶数
+            if (i % 2 == 0) {
+                sum += i;
+            }
+            //修改循环变量
+            i++;
+        }
+        System.out.println("结果为："+sum);
+        System.out.println("程序结束");
     }