Code:-
XML Code:-
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/txtv2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
android:gravity="center"
android:text=" Calculator"
android:textColor="@color/purple_200"
android:textSize="34sp"
android:textStyle="bold"
/>
<EditText
android:id="@+id/num1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/txtv2"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
android:layout_marginBottom="20dp"
android:hint="Number 1"
android:minHeight="48dp" />
<EditText
android:id="@+id/num2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/num1"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
android:layout_marginBottom="20dp"
android:hint="Number 2"
android:minHeight="48dp" />
<TextView
android:id="@+id/result"
android:layout_width="371dp"
android:layout_height="63dp"
android:layout_below="@id/num2"
android:layout_marginLeft="20dp"
android:layout_marginTop="15dp"
android:layout_marginRight="20dp"
android:layout_marginBottom="20dp"
android:background="@android:color/white"
android:hint="Result"
android:textColorLink="#673AB7"
android:textSize="25sp" />
<Button
android:id="@+id/sum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="350dp"
android:layout_marginEnd="307dp"
android:layout_marginBottom="263dp"
android:backgroundTint="@android:color/holo_red_light"
android:onClick="doSum"
android:text="+"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/sub"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="210dp"
android:layout_marginTop="350dp"
android:layout_marginEnd="113dp"
android:layout_marginBottom="263dp"
android:backgroundTint="@android:color/holo_red_light"
android:onClick="doSub"
android:text="-"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.507" />
<Button
android:id="@+id/div"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="307dp"
android:layout_marginTop="350dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="263dp"
android:backgroundTint="@android:color/holo_red_light"
android:onClick="doDiv"
android:text="/"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<!-- A button to perform multiplication. -->
<!-- A button to perform a modulus function. -->
<!-- A button to perform a power function. -->
<Button
android:id="@+id/mul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="400dp"
android:layout_marginEnd="307dp"
android:layout_marginBottom="199dp"
android:backgroundTint="@android:color/holo_red_light"
android:onClick="doMul"
android:text="x"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button"
android:layout_width="103dp"
android:layout_height="48dp"
android:layout_marginStart="113dp"
android:layout_marginTop="400dp"
android:layout_marginEnd="206dp"
android:layout_marginBottom="199dp"
android:backgroundTint="@android:color/holo_red_light"
android:onClick="doMod"
android:text="%(mod)"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.515" />
<Button
android:id="@+id/pow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="113dp"
android:layout_marginTop="350dp"
android:layout_marginEnd="210dp"
android:layout_marginBottom="263dp"
android:backgroundTint="@android:color/holo_red_light"
android:onClick="doPow"
android:text="n1^n2"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.507" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button6"
android:layout_alignParentStart="true"
android:layout_marginStart="17dp"
android:layout_marginLeft="20sp"
android:layout_marginBottom="25dp"
android:text="+"
android:textSize="20sp" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginStart="20dp"
android:layout_marginBottom="177dp"
android:layout_toEndOf="@+id/button5"
android:text="*"
android:textSize="20sp" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="202dp"
android:layout_marginBottom="105dp"
android:text="%(MOD)"
tools:ignore="DuplicateClickableBoundsCheck" />
<Button
android:id="@+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginEnd="307dp"
android:layout_marginBottom="105dp"
android:text="N1*N2" />
<Button
android:id="@+id/button7"
android:layout_width="77dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="16dp"
android:layout_marginEnd="18dp"
android:layout_marginBottom="176dp"
android:layout_toEndOf="@+id/button3"
android:text="/"
android:textSize="20sp" />
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginStart="17dp"
android:layout_marginBottom="177dp"
android:layout_toEndOf="@+id/button2"
android:text="-"
android:textSize="20sp" />
</RelativeLayout>
JAVA Code:-
package com.example.mansamcapro3;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private AppCompatActivity appBarConfiguration;
private ActivityMainBinding binding;
public EditText e1, e2;
TextView t1;
int num1, num2;
public boolean getNumbers() {
//checkAndClear();
// defining the edit text 1 to e1
e1 = (EditText) findViewById(R.id.num1);
// defining the edit text 2 to e2
e2 = (EditText) findViewById(R.id.num2);
// defining the text view to t1
t1 = (TextView) findViewById(R.id.result);
// taking input from text box 1
String s1 = e1.getText().toString();
// taking input from text box 2
String s2 = e2.getText().toString();
if(s1.equals("Please enter value 1") && s2.equals(null))
{
String result = "Please enter value 2";
e2.setText(result);
return false;
}
if(s1.equals(null) && s2.equals("Please enter value 2"))
{
String result = "Please enter value 1";
e1.setText(result);
return false;
}
if(s1.equals("Please enter value 1") || s2.equals("Please enter value 2"))
{
return false;
}
if((!s1.equals(null) && s2.equals(null))|| (!s1.equals("") && s2.equals("")) ){
String result = "Please enter value 2";
e2.setText(result);
return false;
}
if((s1.equals(null) && !s2.equals(null))|| (s1.equals("") && !s2.equals("")) ){
//checkAndClear();
String result = "Please enter value 1";
e1.setText(result);
return false;
}
if((s1.equals(null) && s2.equals(null))|| (s1.equals("") && s2.equals("")) ){
//checkAndClear();
String result1 = "Please enter value 1";
e1.setText(result1);
String result2 = "Please enter value 2";
e2.setText(result2);
return false;
}
else {
// converting string to int.
num1 = Integer.parseInt(s1);
// converting string to int.
num2 = Integer.parseInt(s2);
}
return true;
}
public void doSum(View v) {
// get the input numbers
if (getNumbers()) {
int sum = num1 + num2;
t1.setText(Integer.toString(sum));
}
else
{
t1.setText("Error Please enter Required Values");
}
}
public void clearTextNum1(View v) {
// get the input numbers
e1.getText().clear();
}
public void clearTextNum2(View v) {
// get the input numbers
e2.getText().clear();
}
public void doPow(View v) {
//checkAndClear();
// get the input numbers
if (getNumbers()) {
double sum = Math.pow(num1, num2);
t1.setText(Double.toString(sum));
}
else
{
t1.setText("Error Please enter Required Values");
}
}
// a public method to perform subtraction
public void doSub(View v) {
//checkAndClear();
// get the input numbers
if (getNumbers()) {
int sum = num1 - num2;
t1.setText(Integer.toString(sum));
}
else
{
t1.setText("Error Please enter Required Values");
}
}
// a public method to perform multiplication
public void doMul(View v) {
//checkAndClear();
// get the input numbers
if (getNumbers()) {
int sum = num1 * num2;
t1.setText(Integer.toString(sum));
}
else
{
t1.setText("Error Please enter Required Values");
}
}
// a public method to perform Division
public void doDiv(View v) {
//checkAndClear();
// get the input numbers
if (getNumbers()) {
// displaying the text in text view assigned as t1
double sum = num1 / (num2 * 1.0);
t1.setText(Double.toString(sum));
}
else
{
t1.setText("Error Please enter Required Values");
}
}
// a public method to perform modulus function
public void doMod(View v) {
//checkAndClear();
// get the input numbers
if (getNumbers()) {
double sum = num1 % num2;
t1.setText(Double.toString(sum));
}
else
{
t1.setText("Error Please enter Required Values");
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
e1 = (EditText) findViewById(R.id.num1);
// defining the edit text 2 to e2
e2 = (EditText) findViewById(R.id.num2);
}
}
Output :-
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