Program to find sum of a fibonacci series up to n terms in C.

#include <stdio.h>

#include <math.h>
int main()
{
   long	double n , first =-1  , second = 1 , sum = 0 , third ;
    int i = 0 ;
  	printf("Enter the range: ");
	scanf("%LF" , &n );
	
	
	for (int i = 0 ; i < n ; i++)
	
	{
		third = first + second ;
		sum = sum + third ;
		first = second ;
		second = third ;
	}
    
   
    
     printf("Sum of Fibonacci series for given range is: %.0Lf\n" , sum);
  
	
	return 0 ;
}