diff --git a/.idea/misc.xml b/.idea/misc.xml
index 0548357..1f014b5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
diff --git a/src/Computer.java b/src/Computer.java
index 2d070ca..ddac7c9 100644
--- a/src/Computer.java
+++ b/src/Computer.java
@@ -118,22 +118,18 @@ public class Computer extends JFrame{
                 }
 
                 else if(flag == 1) {
-//加法
                     b = Double.parseDouble(sz[0]) + Double.parseDouble(sz[1]);
                 }
 
                 else if(flag == 2) {
-//减法
                     b = Double.parseDouble(sz[0]) - Double.parseDouble(sz[1]);
                 }
 
                 else if(flag == 3) {
-//乘法
                     b = Double.parseDouble(sz[0]) * Double.parseDouble(sz[1]);
                 }
 
                 else if(flag == 4) {
-//除法
                     b = Double.parseDouble(sz[0]) / Double.parseDouble(sz[1]);
                 }