fork download 
  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n,a=0,b=2,sum=0;
  5. 	scanf("%d",&n);
  6. 	while(a<n){
  7. 		a=a+1;
  8. 		sum=sum+b;
  9. 		b=b*3;
  10.  
  11. 	}
  12. 	printf("初項が2、公比が3の等比数列のn項までの和は%d",sum);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin 
2
stdout 
初項が2、公比が3の等比数列のn項までの和は8
https://ideone.com/FVU13K
language:
C99 (gcc 8.3)
created:
10 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!