diff --git a/jiajianchengchu.java b/jiajianchengchu.java
new file mode 100644
index 0000000..9fe8284
--- /dev/null
+++ b/jiajianchengchu.java
@@ -0,0 +1,24 @@
+class Jiajianchengchu
+{
+    public double jia(double c,double b)
+
+    {
+        return c+b;
+    }
+
+    public double jian(double b,double t)
+
+    {
+        return b-t;
+    }
+    public double cheng(double y,double u)
+    {
+        return y*u;
+
+    }
+    public double chu(double i,double k)
+    {
+        if(k!=0)
+            return i/k;
+    }
+}
diff --git a/main.java b/main.java
deleted file mode 100644
index ebe6bfd..0000000
--- a/main.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package com.company;
-import java.util.*;
-public class Main {
-
-    public static void main(String[] args) {
-
-        Scanner function= new Scanner(System.in);
-        String a=function.nextLine();
-        if(a.equals("sin")||a.equals("cos")||a.equals("tan")){
-            Scanner radian= new Scanner(System.in);
-            double b=radian.nextDouble();
-        }
-        else{
-            Double.parseDouble(a);
-            Scanner sc= new Scanner(System.in);
-            String b=sc.nextLine();
-            Scanner sc1= new Scanner(System.in);
-            double c=sc1.nextDouble();
-            if(b.equals("^"))
-                double d=zhishu.zhishu(a,c);
-            if(b.equals("log"))
-                double d=fengsj1.duishu(a,c);
-            if(b.equals("+"))
-                double d=Jiajianchengchu.jia(a,c);
-            if(b.equals("-"))
-                double d=Jiajianchengchu.jian(a,c);
-            if(b.equals("*"))
-                double d=Jiajianchengchu.cheng(a,c);
-            if(b.equals("/"))
-                double d=Jiajianchengchu.chu(a,c);
-            System.out.println(d);
-        }
-    }
-}
\ No newline at end of file