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  1. #include <stdio.h>
  2. int c=0;
  3.  
  4. int rec(int n){
  5. 	c++;
  6. 	if(n==1){
  7. 		return 1;}
  8. 	else if(n==2){
  9. 		return 2;}
  10. 	else{
  11. 		return -6*rec(n-1)-9*rec(n-2);}
  12.  
  13. }
  14.  
  15. int main(void) {
  16. 	int n=4;
  17. 	printf("数列a%dの値は%d\n",n,rec(n));
  18. 	printf("呼び出しは%d回",c);
  19. 	return 0;
  20.  
  21. }
  22.  
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
stdout
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数列a4の値は108
呼び出しは5回
https://ideone.com/MNeqOz
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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