fork download
copy 
  1. #include <stdio.h>
  2. int a(int n){
  3.     if(n==0){
  4.     	return 2;
  5.     }
  6.     else{ 
  7.         return  -2*a(n-1)+4;
  8.     }
  9. }
  10. int main(void) {
  11. 	int i;
  12. 	scanf("%d", &i);
  13. 	 printf("%d ", a(i));
  14. 	return 0;
  15. }
  16.  
Success #stdin #stdout 0s 5292KB
comments (?)
stdin
copy 
5
stdout
copy 
-20
https://ideone.com/w5cNMb
language:
C (gcc 8.3)
created:
10 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!