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

    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">Calculator</string>
    <string name="allowed_entry">1234567890i+-</string>

</resources>

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

    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">Calculator</string>
    <string name="allowed_entry">1234567890i+-.</string>

</resources>

Add the decimal point to allowable inputs
Add the decimal point to allowable inputs
