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Part 1: Develop a Calculator Use App Inventor to create a simple calculator where the users can perform mathematic operations of addition, subtraction, multiplication, and division. You will need to make the user interface of the calculator look like below: Please note the top of the screen is a display window for showing the users’ inputs and results of the calculations. You should also make sure that the sizes of all the visual components are similar to those in the figure shown above The calculator must be capable of showing each digit the users click and performing the mathematic operations in the exact order the users input. For instance, when a user Assignment 03 Page 2 of 2 inputs this formula “12-8*11/4+255=”, the table below indicates what the display window should show: Pressing the “C” key will clear all previous calculations as well as the display. You can assume the users never input invalid formulas — for example, a formula always starts with a number, the users never press an operator twice consecutively, and the users never make a number divided by 0, etc
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