├── MainActivity.java
├── README.md
└── activity_main.xml


/MainActivity.java:
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  1 | package com.example.hii;
  2 | 
  3 | import android.os.Bundle;
  4 | import android.view.View;
  5 | import android.widget.Button;
  6 | import android.widget.EditText;
  7 | import android.widget.TextView;
  8 | import android.widget.Toast;
  9 | 
 10 | import androidx.appcompat.app.AppCompatActivity;
 11 | 
 12 | public class MainActivity extends AppCompatActivity {
 13 | 
 14 |     private EditText editTextNum1;
 15 |     private EditText editTextNum2;
 16 |     private Button buttonSum,buttonSup,buttonMul,buttonDiv;
 17 |     private TextView textViewResult;
 18 | 
 19 |     @Override
 20 |     protected void onCreate(Bundle savedInstanceState) {
 21 |         super.onCreate(savedInstanceState);
 22 |         setContentView(R.layout.activity_main);
 23 | 
 24 |         editTextNum1 = findViewById(R.id.editTextNum1);
 25 |         editTextNum2 = findViewById(R.id.editTextNum2);
 26 |         buttonSum = findViewById(R.id.buttonSum);
 27 |         buttonSup= findViewById(R.id.buttonSup);
 28 |         buttonMul=findViewById(R.id.buttonMul);
 29 |         buttonDiv=findViewById(R.id.buttonDiv);
 30 |         textViewResult = findViewById(R.id.textViewResult);
 31 | 
 32 |         buttonSum.setOnClickListener(new View.OnClickListener() {
 33 |             @Override
 34 |             public void onClick(View v) {
 35 |                 String num1Str = editTextNum1.getText().toString();
 36 |                 String num2Str = editTextNum2.getText().toString();
 37 | 
 38 |                 if (num1Str.isEmpty() || num2Str.isEmpty()) {
 39 |                     Toast.makeText(MainActivity.this, "Please enter both numbers", Toast.LENGTH_SHORT).show();
 40 |                 } else {
 41 |                     int num1 = Integer.parseInt(num1Str);
 42 |                     int num2 = Integer.parseInt(num2Str);
 43 |                     int sum = num1 + num2;
 44 | 
 45 |                     textViewResult.setText("Result: " + sum);
 46 |                 }
 47 |             }
 48 |         });
 49 | 
 50 |         buttonSup.setOnClickListener(new View.OnClickListener() {
 51 |             @Override
 52 |             public void onClick(View v) {
 53 |                 String num1Str = editTextNum1.getText().toString();
 54 |                 String num2Str = editTextNum2.getText().toString();
 55 | 
 56 |                 if (num1Str.isEmpty() || num2Str.isEmpty()) {
 57 |                     Toast.makeText(MainActivity.this, "Please enter both numbers", Toast.LENGTH_SHORT).show();
 58 |                 } else {
 59 |                     int num1 = Integer.parseInt(num1Str);
 60 |                     int num2 = Integer.parseInt(num2Str);
 61 |                     int sup = num1 - num2;
 62 | 
 63 |                     textViewResult.setText("Result: " + sup);
 64 |                 }
 65 |             }
 66 |         });
 67 | 
 68 |         buttonMul.setOnClickListener(new View.OnClickListener() {
 69 |             @Override
 70 |             public void onClick(View v) {
 71 |                 String num1Str = editTextNum1.getText().toString();
 72 |                 String num2Str = editTextNum2.getText().toString();
 73 | 
 74 |                 if (num1Str.isEmpty() || num2Str.isEmpty()) {
 75 |                     Toast.makeText(MainActivity.this, "Please enter both numbers", Toast.LENGTH_SHORT).show();
 76 |                 } else {
 77 |                     int num1 = Integer.parseInt(num1Str);
 78 |                     int num2 = Integer.parseInt(num2Str);
 79 |                     int mul = num1 * num2;
 80 | 
 81 |                     textViewResult.setText("Result: " + mul);
 82 |                 }
 83 |             }
 84 |         });
 85 | 
 86 |         buttonDiv.setOnClickListener(new View.OnClickListener() {
 87 |             @Override
 88 |             public void onClick(View v) {
 89 |                 String num1Str = editTextNum1.getText().toString();
 90 |                 String num2Str = editTextNum2.getText().toString();
 91 | 
 92 |                 if (num1Str.isEmpty() || num2Str.isEmpty()) {
 93 |                     Toast.makeText(MainActivity.this, "Please enter both numbers", Toast.LENGTH_SHORT).show();
 94 |                 } else {
 95 |                     int num1 = Integer.parseInt(num1Str);
 96 |                     int num2 = Integer.parseInt(num2Str);
 97 |                     int div = num1 / num2;
 98 | 
 99 |                     textViewResult.setText("Result: " + div);
100 |                 }
101 |             }
102 |         });
103 |     }
104 | }
105 | 


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/README.md:
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1 | # simple_calculator
2 | Simple Calculator using android studio
3 | 


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/activity_main.xml:
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 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3 |     xmlns:tools="http://schemas.android.com/tools"
 4 |     android:layout_width="match_parent"
 5 |     android:layout_height="match_parent"
 6 |     tools:context=".MainActivity">
 7 | 
 8 |     <TextView
 9 |         android:id="@+id/textViewNum1"
10 |         android:layout_width="wrap_content"
11 |         android:layout_height="wrap_content"
12 |         android:text="Num 1"
13 |         android:layout_marginTop="50dp"
14 |         android:layout_marginStart="20dp"/>
15 | 
16 |     <EditText
17 |         android:id="@+id/editTextNum1"
18 |         android:layout_width="match_parent"
19 |         android:layout_height="wrap_content"
20 |         android:inputType="number"
21 |         android:layout_below="@id/textViewNum1"
22 |         android:layout_marginStart="20dp"
23 |         android:layout_marginEnd="20dp"
24 |         android:hint="Enter number 1"/>
25 | 
26 |     <TextView
27 |         android:id="@+id/textViewNum2"
28 |         android:layout_width="wrap_content"
29 |         android:layout_height="wrap_content"
30 |         android:text="Num 2"
31 |         android:layout_below="@id/editTextNum1"
32 |         android:layout_marginTop="20dp"
33 |         android:layout_marginStart="20dp"/>
34 | 
35 |     <EditText
36 |         android:id="@+id/editTextNum2"
37 |         android:layout_width="match_parent"
38 |         android:layout_height="wrap_content"
39 |         android:inputType="number"
40 |         android:layout_below="@id/textViewNum2"
41 |         android:layout_marginStart="20dp"
42 |         android:layout_marginEnd="20dp"
43 |         android:hint="Enter number 2"/>
44 | 
45 |     <Button
46 |         android:id="@+id/buttonSum"
47 |         android:layout_width="wrap_content"
48 |         android:layout_height="wrap_content"
49 |         android:layout_below="@id/editTextNum2"
50 |         android:layout_marginTop="40dp"
51 |         android:text="Sum" />
52 | 
53 |     <Button
54 |         android:id="@+id/buttonSup"
55 |         android:layout_width="wrap_content"
56 |         android:layout_height="wrap_content"
57 |         android:layout_below="@id/editTextNum2"
58 |         android:layout_alignParentStart="true"
59 |         android:layout_marginStart="106dp"
60 |         android:layout_marginTop="39dp"
61 |         android:text="Sup" />
62 | 
63 |     <Button
64 |         android:id="@+id/buttonMul"
65 |         android:layout_width="wrap_content"
66 |         android:layout_height="wrap_content"
67 |         android:layout_below="@id/editTextNum2"
68 |         android:layout_alignParentEnd="true"
69 |         android:layout_marginTop="40dp"
70 |         android:layout_marginEnd="104dp"
71 |         android:text="Mul" />
72 | 
73 |     <Button
74 |         android:id="@+id/buttonDiv"
75 |         android:layout_width="wrap_content"
76 |         android:layout_height="wrap_content"
77 |         android:layout_below="@id/editTextNum2"
78 |         android:layout_alignParentEnd="true"
79 |         android:layout_marginTop="42dp"
80 |         android:layout_marginEnd="4dp"
81 |         android:text="Div" />
82 | 
83 |     <TextView
84 |         android:id="@+id/textViewResult"
85 |         android:layout_width="wrap_content"
86 |         android:layout_height="wrap_content"
87 |         android:layout_below="@id/buttonSum"
88 |         android:layout_alignParentStart="true"
89 |         android:layout_marginStart="164dp"
90 |         android:layout_marginTop="94dp"
91 |         android:text="Result"
92 |         android:textSize="18sp" />
93 | </RelativeLayout>


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