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Create a simple calculator that can perform addition, subtraction, multiplication, and division operations. the user can enter a positive or negative number. For the first time, the calculator receives the number$1,$ then the operator, and the number$2.$ Then the user should press $"="$ key to see the result on the LCD. After displaying the results, the display should be cleared and the result will be displayed and considered as the first operand of the new operation.

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