gkausalya232 / calculator

Ex.No:9 Develop a simple calculator using android studio.

AIM:

To develop a program to develop a simple calculator in Android Studio.

EQUIPMENTS REQUIRED:

Android Studio(Latest Version)

ALGORITHM:

Step 1: Open Android Stdio and then click on File -> New -> New project.

Step 2: Then type the Application name as calculator and click Next.

Step 3: Then select the Minimum SDK as shown below and click Next.

Step 4: Then select the Empty Activity and click Next. Finally click Finish.

Step 5: Design layout using UI components in activity_main.xml.

Step 6: Display the calculator operation in MainActivity file.

Step 7: Save and run the application.

PROGRAM:

/*
Program to print the text “calculator operation”.
Developed by:Kausalya G
Registeration Number :212221040076
*/

activity_main.xml:

activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="111dp"
        android:layout_marginTop="25dp"
        app:srcCompat="@drawable/img" />

    <EditText
        android:id="@+id/txt1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginRight="20dp"
        android:ems="10"
        android:hint="First Number"
        android:inputType="numberDecimal"
        tools:ignore="TouchTargetSizeCheck,SpeakableTextPresentCheck" />

    <EditText
        android:id="@+id/txt2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginRight="20dp"
        android:ems="10"
        android:hint="Second Number"
        android:inputType="numberDecimal"
        tools:ignore="SpeakableTextPresentCheck,TouchTargetSizeCheck" />

    <Button
        android:id="@+id/btnadd"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginRight="20dp"
        android:text="Add" />

    <Button
        android:id="@+id/btnsubs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginRight="20dp"
        android:text="Subtract" />

    <Button
        android:id="@+id/btndiv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginRight="20dp"
        android:text="Divide" />

    <Button
        android:id="@+id/btnmult"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="20dp"
        android:layout_marginRight="20dp"
        android:text="Multiply" />

    <TextView
        android:id="@+id/result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="25dp"
        android:layout_marginRight="20dp"
         android:text="Kausalya G"/>
</LinearLayout>

MainActivity.java:

MainActivity.java:
package com.example.calculator;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    Button btnadd,btnsubs,btnmult,btndiv;
    EditText txt1,txt2;
    TextView result;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnadd=findViewById(R.id.btnadd);
        btnsubs=findViewById(R.id.btnsubs);
        btndiv=findViewById(R.id.btndiv);
        btnmult=findViewById(R.id.btnmult);

        txt1=findViewById(R.id.txt1);
        txt2=findViewById(R.id.txt2);

        result=findViewById(R.id.result);

        btnadd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Checking Input First Is Blank Or Not
                if (txt1.getText().toString().equals("")) {
                    // Showing Toast (Message)
                    Toast.makeText(MainActivity.this, "Please Enter Number", Toast.LENGTH_SHORT).show();
                } else if (txt2.getText().toString().equals("")) {
                    Toast.makeText(MainActivity.this, "Please Enter Number", Toast.LENGTH_SHORT).show();
                }

                // Both Inputs Are Not Blank , Starting Calculation
                else {
                    float a, b, c,d,e,f;
                    a = Float.parseFloat(txt1.getText().toString());
                    b = Float.parseFloat(txt2.getText().toString());
                    c = a + b;
                    d= a - b;
                    e= a / b ;
                    f = a * b;
                   // Using Third Variable To Store Output Value
                    result.setText("The Addition Result Is " + c);
                    result.setText("The Subtraction Result Is " + d);
                    result.setText("The Division Result Is " + e);
                    result.setText("The Multiplication Result Is " + f);

                }

            }
        });
    }
}

OUTPUT

RESULT

Thus a Simple Android Application develop a program to create simple calculator in Android Studio is developed and executed successfully.