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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n,i=1,a=2,sum=0;
  5.  
  6. 	scanf("%d",&n);
  7. 	while(n>=i){
  8. 		sum = sum + a;
  9. 		a = a * 3;
  10. 		i = i + 1;
  11. 	}
  12. 	printf("合計:%d",sum);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5324KB
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合計:80
https://ideone.com/E7lIMK
2026/5/7 提出課題3
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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