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  1. #include <stdio.h>
  2. int count=0;
  3. int rec(int n){
  4. 	count++;
  5. if (n==1){
  6. 	return 1;
  7. }	
  8. else if(n==2){
  9. 	return 2;
  10. }
  11. else {
  12. 	return -6*rec(n-1)-9*rec(n-2);
  13. }
  14. }
  15.  
  16. int main(void){
  17. 	int n=5;
  18. 	int result =rec(n);
  19. 	printf("数列はa%dの値は%d\n",n,result);
  20. 	printf("このときrecの呼び出し回数は%d",count);
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 5324KB
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Standard input is empty
stdout
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数列はa5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/oH3gY8
language:
C (gcc 8.3)
created:
17 hours ago
visibility:
public

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