Explanation:In the above program, user-defined functions display()and input()are
declared and defined. The display() function is used to display passed integer on the screen.
The input() function when executed asks for an integer. The function input() is used as
default value for function display(). When a function display() is invoked without argu-
ment, the input() function assigned as default argument in function prototype is executed.
User enters a number ...
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