fork download
copy 
  1. #include <stdio.h>
  2.  
  3. int fib1(int n){
  4.  
  5. 	int f1=0,f2=1,f,i;
  6.  
  7. 	for(i=2;i<=n;i++){
  8.  
  9. 		f = f1+f2;
  10.  
  11. 		f1=f2;
  12.  
  13. 		f2=f;
  14.  
  15. 	}
  16.  
  17. 	return f;
  18.  
  19. }
  20.  
  21. int fib2(int n){
  22.  
  23. 	int f[64],i;
  24.  
  25. 	f[0]=0;
  26. 	f[1]=1;
  27.  
  28. 	for(i=2;i<=n;i++){
  29.  
  30. 		f[i]=f[i-2]+f[i-1];
  31.  
  32. 	}
  33.  
  34. 	return f[n];
  35.  
  36. }
  37.  
  38. int fib3(int n){
  39.  
  40. 		if(n==0) 
  41. 		return 0;
  42.  
  43. 	else if(n==1)
  44. 		return 1;
  45.  
  46. 	else
  47. 		return fib1(n-1)+fib1(n-2);
  48.  
  49. }
  50.  
  51. int main(void) {
  52.  
  53. 	int n;
  54.  
  55. 	scanf("%d",&n);
  56.  
  57. 	printf("1:%d\n",fib1(n));
  58.  
  59. 	printf("2:%d\n",fib2(n));
  60.  
  61. 	printf("3:%d\n",fib3(n));
  62.  
  63. 	return 0;
  64. }
  65.  
Success #stdin #stdout 0s 5332KB
comments (?)
stdin
copy 
5
stdout
copy 
1:5
2:5
3:5
https://ideone.com/Aa8qRq
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!