This code is a simple C program that calculates the Fibonacci number at the position given by the user. Let me explain the code in non-technical terms.
1. #include <stdio.h>: This line tells the program to include a library (a set of pre-written functions) that allows it to perform input and output operations, like reading from the keyboard and displaying text on the screen.
2. The fib function: This is a custom function created to calculate the Fibonacci numbers. It takes an integer n as input and returns the Fibonacci number at that position. The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, starting from 0 and 1. The function uses a recursive approach, calling 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.
3. The main function: This is the starting point of the program. It first declares an integer variable 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 using the printf function. Finally, it returns 0 to indicate that the program has executed successfully.
In summary, this program asks the user for an integer input, calculates the Fibonacci number at that position using a recursive function, and displays the result on the screen.
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