This program calculates the Fibonacci number at the position given by the user. It does this by using a custom function called "fib" that takes an integer n as input and returns the Fibonacci number at that position.

The program starts by including a library called "stdio.h" that allows it to perform input and output operations like reading from the keyboard and displaying text on the screen.

The main function is where the program starts running. It first declares an integer variable called "input" to store the user's input. Then, it uses the scanf function to read an integer from the keyboard and store it in the input variable.

After that, it calls the fib function with the input value and displays the result on the screen using the printf function.

The fib function uses a recursive approach to calculate Fibonacci numbers. It calls itself with smaller n values until it reaches the base cases (when n is 0 or 1), at which point it returns the value of n directly.

Finally, the program returns 0 to indicate that it has executed successfully.
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