/* 
 * Program to Display Fibonacci Sequence - Fibonacci Sequence Up to a Certain Number 
 */

#include <stdio.h>

/* Entry point to program */
int main() 
{
	unsigned long t1 = 0, t2 = 1, nextTerm = 0, n;
	
	printf("Enter a positive number (max. 2147483647): ");
	scanf("%ld", &n); /* scanf isn't able process unsigned long */
	printf("Maximum: %lu \n", n);

	/* Displays the first two terms which is always 0 and 1 */
	printf("Fibonacci Series: %lu, %lu, ", t1, t2);
	
	nextTerm = t1 + t2;
	
	while (nextTerm < n)
	{
		printf("%lu, ", nextTerm);
		
		nextTerm = t1 + t2;
		t1 = t2;
		t2 = nextTerm;
	}
	
	return 0;
}