Write asimple calculatorapp. The app adds, subtracts, multiplies, anddivides two values. The input values are entered in two input boxes which are located near the top horizontally and centered. The four operations are performed using four buttons which are located below the input boxes horizontally and centered. The buttons are labeled by their single character operators. The output is displayed below the four buttons and centered. There are no labels anywhere. The inputs and outputs are float types. Design a good interface by choosing appropriate colors, fonts, spaces, input/output boxes, and buttons.