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  1. #include <stdio.h>
  2.  
  3. int c;
  4.  
  5. int rec (int n){
  6. 	c++;
  7. 	if ( n==1 ){
  8. 		return 1;
  9. 	}
  10. 	else if (n==2){
  11. 		return 2;
  12. 	}
  13. 	else{
  14. 		return -6*rec(n-1)-9*rec(n-2);
  15. 	}
  16.  
  17. }
  18.  
  19. int main(void) {
  20. 	int n =5;
  21. 	printf("数列a%dの値は%d\n",n,rec(n));
  22. 	printf("このときrecの呼び出し回数は%d",c);
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/5MSY8a
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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