troubleshooting Question

Why Switch Case Ends Up in an Infinite Loop When user Enters Letters? C/C++

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F-J-KFlag for Canada asked on
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I have switch statement that takes an int e.g. switch(userNumber). When i type a letter from keyboard, the default: does not get implemented. I stuck in a loop. Why? How can i avoid it?

default get implemented only when user enter number that is not in the menu.
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