Extend the Calculator programming example of this chapter by adding three buttons with the labels M, R, and E as follows: If the user clicks the button M, the number currently in the displayText field is stored in the variable, say, memory; if the user clicks the button R, the number stored in memory is displayed and also becomes the first number (so that another number can be added, subtracted, multiplied, or divided); and if the user clicks the button E, the program terminates.
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