fork download
copy 
  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int i=1,n,sum=0,pre=2;//pre…前項
  5.  
  6. 	scanf("%d",&n);
  7. 	while(i<=n){
  8. 		sum=sum+pre;
  9. 		pre=pre*3;
  10. 		i=i+1;
  11. 	}
  12. 	printf("%d",sum);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
copy 
3
stdout
copy 
26
https://ideone.com/nemcpD
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!