the Fibonacci number calculator

Code:
/*
		Humza Khawar
		fibonacci series
		*/

#include<stdio.h>

int Rec_fibonacci(int);//calaulates fibinocci series using recursion
int Loop_fibonacci(int);//calaulates fibinocci series using loop

int main() 
{
	int num;

	printf("\n Enter num : ");//input number
	scanf_s("%d", &num);
	
	
	printf(" \nRecursion: fibonacci( %d ) is %d \n",num, Rec_fibonacci(num));//prints the desired output through recursion function
	printf(" \nLoop: fibonacci( %d ) is %d \n", num, Loop_fibonacci(num));//prints the desired output through loop function
	
	return 0;
}

int Rec_fibonacci(int num)
{
	{static int first_num = 0, second_num = 1, next_num; //static variables so we can keep using their values

			if (num >= 2)
			{

				next_num = first_num + second_num;	//the fibonacci definition
				first_num = second_num;
				second_num = next_num;
				num--;
				Rec_fibonacci(num); //recursion


				return next_num; //returning the result
			}
			else
			{
				return 1;
			}
	}
}


int Loop_fibonacci(int num)
{
	int first_num = 0, second_num = 1, fib_num = 0;//initialitzation

	while (num>1)//loop to sum numbers until desired number is achieved
	{
		fib_num = first_num + second_num;//fibonoci formula
		first_num = second_num;
		second_num = fib_num;
		--num;
	}

	return fib_num;//returning value
}