It is a Calculator app that does simple calculations like addition, subtraction, multiplications, division, and remainder.
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Users can write positive numbers, negative numbers, whole numbers, and real numbers.
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The operation appears on the screen to enable users to see what they write.
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If users write something wrong, they can erase it and retype.
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Users can hear the result of the operation in words.
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The calculator saves the calculations' history, and users can remove it.
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