fibnacciSum.c

#include <stdio.h>

void main()
{
	long unsigned int n, a = -1, b = 1, c, i, sum = 0;

	printf("Enter the Number of terms:");
	scanf("%lu", &n);
	for (i = 1; i <= n; i++)
	{
		c = a + b;
		a = b;
		b = c;
		sum += c;
	}
	printf("Sum = %lu", sum);
}