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  1. #include <stdio.h>
  2. //a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
  3. int c=0;
  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.     int result=rec(n);
  18.     printf("数列a%dの値は%d\n", n, result);
  19.     printf("rec関数が呼び出された回数は%d回です\n", c);
  20. 	return 0;
  21. }
  22.  
  23.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a4の値は108
rec関数が呼び出された回数は5回です
https://ideone.com/3t5GDs
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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