diff --git a/.idea/deploymentTargetDropDown.xml b/.idea/deploymentTargetDropDown.xml
index 4ea7061..828dc84 100644
--- a/.idea/deploymentTargetDropDown.xml
+++ b/.idea/deploymentTargetDropDown.xml
@@ -18,6 +18,9 @@
           <timeTargetWasSelectedWithDropDown value="2024-03-26T06:34:42.198995747Z" />
         </State>
       </entry>
+      <entry key="Page3">
+        <State />
+      </entry>
       <entry key="app">
         <State />
       </entry>
diff --git a/app/src/main/java/uk/kagurach/android101/Kaculate.kt b/app/src/main/java/uk/kagurach/android101/Kaculate.kt
new file mode 100644
index 0000000..b75d025
--- /dev/null
+++ b/app/src/main/java/uk/kagurach/android101/Kaculate.kt
@@ -0,0 +1,7 @@
+package uk.kagurach.android101
+
+import android.content.Context
+
+fun Kaculate(src: String,ctx :Context) : String{
+    return ""
+}
\ No newline at end of file
diff --git a/app/src/main/java/uk/kagurach/android101/Page3.java b/app/src/main/java/uk/kagurach/android101/Page3.java
index 5191650..f41c849 100644
--- a/app/src/main/java/uk/kagurach/android101/Page3.java
+++ b/app/src/main/java/uk/kagurach/android101/Page3.java
@@ -1,6 +1,11 @@
 package uk.kagurach.android101;
 
+import static uk.kagurach.android101.KaculateKt.Kaculate;
+
 import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
 
 import androidx.activity.EdgeToEdge;
 import androidx.appcompat.app.AppCompatActivity;
@@ -8,6 +13,7 @@ import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
 
+import uk.kagurach.android101.KaculateKt;
 public class Page3 extends AppCompatActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -19,6 +25,57 @@ public class Page3 extends AppCompatActivity {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
             return insets;
         });
+        findViewById(R.id.P3_0).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_1).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_2).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_3).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_4).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_5).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_6).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_7).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_8).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3_9).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3BK).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3X).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3Plus).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3Minus).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3Div).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3Dot).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3CE).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3ChengFang).setOnClickListener(new CalculateOnClickListener());
+        findViewById(R.id.P3Result).setOnClickListener(new CalculateOnClickListener());
     }
 
+
+
+    class CalculateOnClickListener implements View.OnClickListener{
+        @Override
+        public void onClick(View v){
+            TextView tv = findViewById(R.id.P3CalcResult);
+            String s = tv.getText().toString();
+            String o = ((Button)v).getText().toString();
+            switch (o){
+                case "退格":
+                    if (!s.isEmpty()){
+                        s = s.substring(0,s.length()-1);
+                    }
+                    break;
+                case "CE":
+                    s = "";
+                    break;
+                case "=":
+                    calc();
+                    return;
+                default:
+                    s += o;
+            }
+            tv.setText(s);
+        }
+    }
+
+    private void calc(){
+        TextView textView = findViewById(R.id.P3Result);
+        String result = Kaculate(textView.getText().toString(),this);
+        textView.setText(result);
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_page3.xml b/app/src/main/res/layout/activity_page3.xml
index 3b64a03..88230d4 100644
--- a/app/src/main/res/layout/activity_page3.xml
+++ b/app/src/main/res/layout/activity_page3.xml
@@ -7,4 +7,195 @@
     android:layout_height="match_parent"
     tools:context=".Page3">
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+        <View
+            android:id="@+id/view"
+            android:layout_width="match_parent"
+            android:layout_height="35dp" />
+
+        <TextView
+            android:id="@+id/P3CalcName"
+            android:layout_width="match_parent"
+            android:layout_height="50dp"
+            android:text="@string/kaculate"
+            android:textSize="40sp"/>
+
+        <TextView
+            android:id="@+id/P3CalcResult"
+            android:layout_width="match_parent"
+            android:layout_height="400dp"
+            android:text="" />
+
+        <GridLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:columnCount="4"
+            android:rowCount="5">
+
+
+            <Button
+                android:id="@+id/P3CE"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="0"
+                android:layout_column="0"
+                android:text="CE" />
+
+            <Button
+                android:id="@+id/P3Div"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="0"
+                android:layout_column="1"
+                android:text="/" />
+
+            <Button
+                android:id="@+id/P3X"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="0"
+                android:layout_column="2"
+                android:text="x" />
+
+            <Button
+                android:id="@+id/P3Nextpage"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="0"
+                android:layout_column="3"
+                android:text="@string/next_page" />
+
+            <Button
+                android:id="@+id/P3_7"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="1"
+                android:layout_column="0"
+                android:text="7" />
+
+            <Button
+                android:id="@+id/P3_8"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="1"
+                android:layout_column="1"
+                android:text="8" />
+
+            <Button
+                android:id="@+id/P3_9"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="1"
+                android:layout_column="2"
+                android:text="9" />
+
+            <Button
+                android:id="@+id/P3Plus"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="1"
+                android:layout_column="3"
+                android:text="+" />
+
+            <Button
+                android:id="@+id/P3_4"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="2"
+                android:layout_column="0"
+                android:text="4" />
+
+            <Button
+                android:id="@+id/P3_5"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="2"
+                android:layout_column="1"
+                android:text="5" />
+
+            <Button
+                android:id="@+id/P3_6"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="2"
+                android:layout_column="2"
+                android:text="6" />
+
+            <Button
+                android:id="@+id/P3Minus"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="2"
+                android:layout_column="3"
+                android:text="-" />
+
+            <Button
+                android:id="@+id/P3_1"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="3"
+                android:layout_column="0"
+                android:text="1" />
+
+            <Button
+                android:id="@+id/P3_2"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="3"
+                android:layout_column="1"
+                android:text="2" />
+
+            <Button
+                android:id="@+id/P3_3"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="3"
+                android:layout_column="2"
+                android:text="3" />
+
+            <Button
+                android:id="@+id/P3ChengFang"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="3"
+                android:layout_column="3"
+                android:text="^" />
+
+            <Button
+                android:id="@+id/P3BK"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="4"
+                android:layout_column="0"
+                android:text="@string/Backspace" />
+
+            <Button
+                android:id="@+id/P3_0"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="4"
+                android:layout_column="1"
+                android:text="0" />
+
+            <Button
+                android:id="@+id/P3Dot"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="4"
+                android:layout_column="2"
+                android:text="." />
+
+            <Button
+                android:id="@+id/P3Result"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_row="4"
+                android:layout_column="3"
+                android:text="=" />
+        </GridLayout>
+
+    </LinearLayout>
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 46b4d3a..f7b0d26 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -7,4 +7,6 @@
     <string name="set_color">设置颜色</string>
     <string name="set">设置</string>
     <string name="setText">设置文本</string>
+    <string name="kaculate">Kaculate</string>
+    <string name="Backspace">退格</string>
 </resources>
\ No newline at end of file