fork download
copy 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6. 	int n, a=1, b=1,c, suma=0;
  7. 	cin >> n;
  8.  
  9. 	if (n==1) suma=1;
  10. 	if (n==2) suma=2;
  11.  
  12. 	if (n>=3)
  13. 	{
  14. 		suma=2;
  15. 		for (int i=3;i<=n;i++)
  16. 		{
  17. 			c=a+b;
  18. 			suma+=c;	//suma=suma+c;
  19. 			a=b;
  20. 			b=c;
  21. 		}
  22. 	}
  23.  
  24. 	cout << suma << endl;
  25.  
  26. 	return 0;
  27. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin
copy 
6
stdout
copy 
20
https://ideone.com/zMb05r
suma n wyrazow ciagu Fibonacciego
language:
C++ (gcc 8.3)
created:
8 hours 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!