gcd

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

private EditText num1EditText, num2EditText;
private Button calculateButton;
private TextView resultTextView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    num1EditText = findViewById(R.id.num1EditText);
    num2EditText = findViewById(R.id.num2EditText);
    calculateButton = findViewById(R.id.calculateButton);
    resultTextView = findViewById(R.id.resultTextView);

    calculateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int num1 = Integer.parseInt(num1EditText.getText().toString());
            int num2 = Integer.parseInt(num2EditText.getText().toString());
            int gcd = calculateGCD(num1, num2);
            resultTextView.setText("GCD: " + gcd);
        }
    });
}

private int calculateGCD(int num1, int num2) {
    while (num2 != 0) {
        int temp = num2;
        num2 = num1 % num2;
        num1 = temp;
    }
    return num1;
}

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="16dp" tools:context=".MainActivity">

<EditText
    android:id="@+id/num1EditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Enter number 1"
    android:inputType="number" />

<EditText
    android:id="@+id/num2EditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="Enter number 2"
    android:inputType="number" />

<Button
    android:id="@+id/calculateButton"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Calculate GCD" />

<TextView
    android:id="@+id/resultTextView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:textStyle="bold"
    android:paddingTop="16dp" />

</LinearLayout>