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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n,i,a=2,sum=0;
  5. 	scanf("%d",&n);
  6. 	i=n;
  7. 	while(n>0){
  8. 		sum=sum+a;
  9. 		a=a*3;
  10. 		n=n-1;
  11. 	}
  12. 	printf("第%d公までの和=%d",i,sum);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5320KB
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5
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第5公までの和=242
https://ideone.com/tCqyVR
language:
C (gcc 8.3)
created:
11 hours ago
visibility:
public

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