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  1. #include <stdio.h>
  2.  
  3. int fib1(int n)
  4. {
  5. 	int i,fn,fa=1,fb=0;
  6. 	if(n==0)
  7. 		return 0;
  8. 	else if(n==1)
  9. 		return 1;
  10. 	else
  11. 	{
  12. 		for(i=2;i<n;i++)
  13. 		{
  14. 			fn=fa+fb;
  15. 			fa=fn;
  16. 			fb=fa;
  17. 		}
  18. 	return fn;
  19. 	}
  20. }
  21.  
  22.  
  23. int main(void) {
  24.  
  25. 	int n;
  26. 	scanf("%d",&n);
  27. 	printf("%d",fib1(n));
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5308KB
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https://ideone.com/gIxX8r
language:
C (gcc 8.3)
created:
15 days ago
visibility:
public

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