OthmanAlthabit

## arr,fac,fib.cpp
#include <iostream>
using namespace std;

int fac(int x) {
	if (x <= 1) return 1;
	return x * fac(x - 1);
}

int fab(int x) {
	if (x == 0) return 0;
	#include <iostream>
	using namespace std;

	int fac(int x) {
	if (x <= 1) return 1;
	return x * fac(x - 1);
	}

	int fab(int x) {
	if (x == 0) return 0;