P19_a.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:background="@color/white"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="First Number"
        android:textColor="#F2810A"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@+id/editText2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="15"
        android:textColor="@color/black"
        android:textColorHint="@color/black"
        android:hint="Enter first number"
        android:inputType="numberDecimal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"/>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        android:text="Second Number"
        android:textStyle="bold"
        android:textColor="#F2810A"
        app:layout_constraintStart_toStartOf="@+id/textView"
        app:layout_constraintTop_toBottomOf="@+id/editText2" />



    <EditText
        android:id="@+id/editText3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:ems="15"
        android:textColor="@color/black"
        android:textColorHint="@color/black"
        android:hint="Enter second number"
        android:inputType="numberDecimal"
        app:layout_constraintStart_toStartOf="@+id/editText2"
        app:layout_constraintTop_toBottomOf="@+id/textView2"
        app:layout_constraintVertical_bias="0.0" />


    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="48dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@id/editText3"
        app:layout_constraintStart_toStartOf="parent">

        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+"
            android:textColorHint="@color/black"
            android:textColor="@color/black"
            app:layout_constraintBottom_toTopOf="@+id/radioButton2"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/editText3" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="-"
            android:textColorHint="@color/black"
            android:textColor="@color/black"
            app:layout_constraintBottom_toTopOf="@+id/radioButton3"
            app:layout_constraintStart_toStartOf="@+id/radioButton"
            app:layout_constraintTop_toBottomOf="@+id/radioButton" />

        <RadioButton
            android:id="@+id/radioButton3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="*"
            android:textColorHint="@color/black"
            android:textColor="@color/black"
            app:layout_constraintBottom_toTopOf="@+id/radioButton4"
            app:layout_constraintStart_toStartOf="@+id/radioButton2"
            app:layout_constraintTop_toBottomOf="@+id/radioButton2" />

        <RadioButton
            android:id="@+id/radioButton4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="/"
            android:textColorHint="@color/black"
            android:textColor="@color/black"
            app:layout_constraintBottom_toTopOf="@+id/button"
            app:layout_constraintStart_toStartOf="@+id/radioButton3"
            app:layout_constraintTop_toBottomOf="@+id/radioButton3" />
    </RadioGroup>

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="compute"
        android:backgroundTint="#F2810A"
        android:layout_marginTop="48dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>