This code is a simple C program that calculates the Fibonacci number at a given position using a recursive method. Let me explain each part of the code in non-technical words:

#include <stdio.h>: This line tells the program to include a library called "stdio.h". This library contains functions for input and output, like reading from the keyboard and printing to the screen.

int fib(int n) { ... }: This part defines a function called "fib" that takes a single input, an integer called "n". This function calculates the Fibonacci number at position "n" using a recursive method. In simple terms, the function calls itself with smaller values of "n" until it reaches a base case (when "n" is 0 or 1). The Fibonacci numbers are calculated by adding the two previous Fibonacci numbers together (except for the first two numbers, which are 0 and 1).

int main() { ... }: This part defines the main function, which is where the program starts running. Inside this function, the program does the following:

a. int input;: This line declares a variable called "input" to store an integer value.

b. scanf("%d", &input);: This line reads an integer value from the keyboard and stores it in the "input" variable. The user needs to provide this input, which represents the position of the desired Fibonacci number.

c. printf("%d", fib(input));: This line calls the "fib" function with the value of the "input" variable and then prints the result (the Fibonacci number at the given position) on the screen.

d. return 0;: This line tells the program that it has finished running successfully.

In summary, this code allows the user to input an integer representing the position of a Fibonacci number, calculates that number using a recursive method, and then prints the result on the screen.
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