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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. int n,sum=0;
  5. int a0=2,i=0;
  6. scanf("%d",&n);
  7. while(i<=n){
  8. 	sum+=a0;
  9. 	a0=a0*3;
  10. 	i++;
  11. }
  12. printf("第０項から第ｎ項までの和は%d\n",sum);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5312KB
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第０項から第ｎ項までの和は26
https://ideone.com/rVxBD4
language:
C99 (gcc 8.3)
created:
2 hours ago
visibility:
public

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