Implement, in rPeANUt, the a Fibonacci function by using the simple recursive approach. The Fibonacci function can be implemented in c as follow:
int fib(int x) {
if (x<2) {
return x;
} else {
return fib(x-1) + fib(x-2);
}
Test your implementation (e.g. fib(5) == 5, fib(7) == 13, fib(8) == 21)? What is the biggest Fibonacci number you can calculate in under about 1min of execution time?