Sure, this C program calculates and prints the nth number in the Fibonacci sequence based on user input. It does so by defining a recursive function "fib" that takes an integer input "n" and returns the nth Fibonacci number. The program reads an integer input from the user using "scanf", calls the "fib" function with the input as the argument, and prints the result using "printf". The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding numbers, starting with 0 and 1.
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