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  1. #include <stdio.h>
  2.  
  3. int fib1(int n)
  4. {
  5. 	int a=0,b=1,c;
  6. 	if(n==0)
  7. 		return 0;
  8. 	else if(n==1)
  9. 		return 1;
  10. 	else
  11. 		for(int i=2; i<=n; a=b,b=c,i++)
  12. 			c = a + b;
  13. 			return c;
  14. }
  15.  
  16. int fib2(int n)
  17. {
  18. 	int f[47];
  19. 	f[0]=0;
  20. 	f[1]=1;
  21. 	for(int i=2; i<=n; i++){
  22. 		f[i]=f[i-2]+f[i-1];
  23. 	}
  24. 	return f[n];
  25. }
  26.  
  27. int fib3(int n)
  28. {
  29. 	if(n==0)
  30. 		return 0;
  31. 	else if(n==1)
  32. 		return 1;
  33. 	else
  34. 		return fib3(n-2)+fib3(n-1);
  35. }
  36.  
  37.  
  38. int main(void) {
  39. 	int n;
  40.  
  41. 	scanf("%d",&n);
  42.  
  43. 	printf("1: %d\n",fib1(n));
  44. 	printf("2: %d\n",fib2(n));
  45. 	printf("3: %d\n",fib3(n));
  46.  
  47. 	return 0;
  48. }
  49.  
Success #stdin #stdout 0s 5296KB
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3
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1: 2
2: 2
3: 2
https://ideone.com/oXEEMA
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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