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  1. #include <stdio.h>
  2.  
  3. int sumodd(int n){
  4. 	if(n<=0) return 0;
  5. 	if(n%2==1)
  6. 	return n + sumodd(n-1);
  7. 	else
  8. 	return sumodd(n-1);
  9.  
  10. }
  11.  
  12. int main(void) {
  13.  
  14. 	int n;
  15. 	scanf("%d",&n);
  16. 	if(n<=0){
  17. 		printf("エラー");
  18. 		return 1;
  19. 	}
  20. 	int result=sumodd(n);
  21. 	printf("1から%dまでの奇数の和は%dです",n,result);
  22.  
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5320KB
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stdin
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10
stdout
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1から10までの奇数の和は25です
https://ideone.com/tpp8lB
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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