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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// FIBONACCI
  6.      int n;
  7.     cout<<"ingrese el valor de n:"<<endl;
  8.     cin>>n;
  9.     if(n==1 || n==2){
  10.        cout<<1<<endl;
  11.     }else{
  12.        long a=1,b=1,c;
  13.        for(int i=2; i<n;i++){
  14.              c=a+b;
  15.              a=b;
  16.              b=c; 
  17.        }
  18.        cout<<c<<endl;
  19.     }
  20. 	return 0;
  21. }
Success #stdin #stdout 0.01s 5268KB
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8
stdout
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ingrese el valor de n:
21
https://ideone.com/yTUhj1
language:
C++ (gcc 8.3)
created:
74 days ago
visibility:
public

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