Fib Hard

Created on Dec. 8, 2024 by Julien Palard

Redact a program accepting an integer n and printing the result of fib(n).

fib implements Fibonacci sequence with: fib(0) == 1 and fib(1) == 1.

So I want:

$ ./fib 0
1
$ ./fib 1
1
$ ./fib 2
2
$ ./fib 3
3
$ ./fib 4
5
$ ./fib 5
8
$ ./fib 6
13
$ ./fib 7
21

and so on.