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+ <?xml version =" 1.0" encoding =" utf-8" ?>
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+ <androidx .constraintlayout.widget.ConstraintLayout
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+ xmlns : android =" http://schemas.android.com/apk/res/android"
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+ xmlns : tools =" http://schemas.android.com/tools"
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+ xmlns : app =" http://schemas.android.com/apk/res-auto"
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+ android : layout_width =" match_parent"
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+ android : layout_height =" match_parent"
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+ tools : context =" .activities.HomeActivity" >
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+
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+ <TextView
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+ android : id =" @+id/welcome_text"
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+ android : text =" Welcome To My Calculator!"
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+ android : textSize =" 48sp"
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+ android : autoSizeTextType =" uniform"
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+ android : layout_width =" wrap_content"
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+ android : layout_height =" wrap_content"
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+ app : layout_constraintTop_toTopOf =" parent"
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+ app : layout_constraintEnd_toEndOf =" parent"
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+ app : layout_constraintStart_toStartOf =" parent"
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+ android : layout_marginTop =" 100dp" />
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+
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+ <Button
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+ android : id =" @+id/btn_simple_calculator"
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+ android : text =" Simple Calculator"
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+ android : textSize =" 48sp"
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+ android : paddingVertical =" 10dp"
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+ android : layout_width =" wrap_content"
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+ android : layout_height =" wrap_content"
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+ app : layout_constraintEnd_toEndOf =" parent"
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+ app : layout_constraintStart_toStartOf =" parent"
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+ app : layout_constraintBottom_toTopOf =" @id/btn_advanced_calculator"
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+ android : layout_marginBottom =" 30dp" />
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+
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+ <Button
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+ android : id =" @+id/btn_advanced_calculator"
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+ android : text =" Advanced Calculator"
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+ android : textSize =" 48sp"
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+ android : paddingVertical =" 10dp"
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+ android : layout_width =" wrap_content"
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+ android : layout_height =" wrap_content"
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+ app : layout_constraintStart_toStartOf =" parent"
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+ app : layout_constraintEnd_toEndOf =" parent"
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+ app : layout_constraintBottom_toTopOf =" @id/btn_about"
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+ android : layout_marginBottom =" 30dp" />
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+
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+ <Button
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+ android : id =" @+id/btn_about"
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+ android : text =" About"
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+ android : textSize =" 48sp"
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+ android : paddingVertical =" 10dp"
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+ android : paddingHorizontal =" 50dp"
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+ android : layout_width =" wrap_content"
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+ android : layout_height =" wrap_content"
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+ app : layout_constraintStart_toStartOf =" parent"
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+ app : layout_constraintEnd_toEndOf =" parent"
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+ app : layout_constraintBottom_toTopOf =" @id/btn_close_app"
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+ android : layout_marginBottom =" 30dp" />
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+
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+ <Button
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+ android : id =" @+id/btn_close_app"
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+ android : text =" Exit"
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+ android : textSize =" 48sp"
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+ android : paddingVertical =" 10dp"
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+ android : paddingHorizontal =" 50dp"
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+ android : layout_width =" wrap_content"
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+ android : layout_height =" wrap_content"
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+ app : layout_constraintStart_toStartOf =" parent"
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+ app : layout_constraintEnd_toEndOf =" parent"
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+ app : layout_constraintBottom_toBottomOf =" parent"
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+ android : layout_marginBottom =" 40dp" />
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+
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+ </androidx .constraintlayout.widget.ConstraintLayout>
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