xml file-
<androidx.constraintlayout.widget.ConstraintLayout 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" tools:context=".MainActivity">
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="To Calculate GCD"
android:textSize="34sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.057" />
<TextView
android:id="@+id/no1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="No1="
android:textSize="24sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.161"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.22" />
<TextView
android:id="@+id/no2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="58dp"
android:layout_marginTop="52dp"
android:layout_marginEnd="296dp"
android:text="No2="
android:textSize="24sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/no1"
app:layout_constraintVertical_bias="0.0" />
<EditText
android:id="@+id/n1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="56dp"
android:layout_marginEnd="76dp"
android:layout_marginBottom="44dp"
android:ems="10"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/no1"
app:layout_constraintTop_toBottomOf="@+id/textView4" />
<EditText
android:id="@+id/n2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="76dp"
android:ems="10"
android:inputType="textPersonName"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toEndOf="@+id/no2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.327"
tools:ignore="MissingConstraints" />
<Button
android:id="@+id/gcd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GCD"
android:textSize="30dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.461"
tools:ignore="MissingConstraints" />
<TextView
android:id="@+id/result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="128dp"
android:layout_marginEnd="145dp"
android:text="Ans="
android:textSize="34sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.508"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.637" />
</androidx.constraintlayout.widget.ConstraintLayout>
java file-
package com.example.gcd;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView num1,num2;
private Button btn1;
private TextView ans;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
num1=(TextView) findViewById(R.id.n1);
num2=(TextView) findViewById(R.id.n2);
btn1=(Button) findViewById(R.id.gcd);
ans=(TextView) findViewById(R.id.result);
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
double no1= Double.parseDouble(num1.getText().toString());
double no2= Double.parseDouble(num2.getText().toString());
double gcd=1;
for (int i=1; i<=no1 && i<=no2;i++)
{
if(no1%i==0 && no2%i==0)
{
gcd=i;
}
ans.setText("GCD="+gcd);
}
}
});
}
}