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  1. #include <stdio.h>
  2.  
  3. int rec (int n){
  4. 	if (n==1){
  5. 		return 1;
  6. 	}
  7. 	else if (n==2){
  8. 		return 2;
  9. 	}
  10. 	else{
  11. 		return -6*rec(n-1)-9*rec(n-2);
  12. 	}
  13. }
  14. int main (void){
  15. 	int n=3;
  16. 	printf("この漸化式の第%d項目の値は%d",n,rec(n));
  17. 	return 0;
  18. }
Success #stdin #stdout 0s 5316KB
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この漸化式の第3項目の値は-21
https://ideone.com/9kUUMc
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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