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<?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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tempNo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/zero"
        app:layout_constraintBottom_toTopOf="@+id/calculate"
        app:layout_constraintEnd_toStartOf="@+id/addition"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintStart_toEndOf="@+id/subtraction"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.065" />

    <Button
        android:id="@+id/subtraction"
        android:onClick="subtract"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="4dp"
        android:text="@string/subtractSign"
        app:layout_constraintEnd_toStartOf="@+id/addition"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/addition"
        android:onClick="add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/addSign"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/calculate"
        android:onClick="calculate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="196dp"
        android:text="@string/calculate"
        app:layout_constraintBottom_toTopOf="@+id/clear"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/clear"
        android:onClick="clear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="176dp"
        android:text="@string/clear"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0"
        app:layout_constraintBottom_toTopOf="@+id/clear"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/calculate" />

</androidx.constraintlayout.widget.ConstraintLayout>