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  1. #include <stdio.h>
  2.  
  3. int c = 0;
  4.  
  5. int rec(int n){
  6.  
  7. 	c++;
  8.  
  9. 	if(n == 1){
  10. 		return 1;
  11. 	} else if(n == 2){
  12. 		return 2;
  13. 	} else {
  14. 		return -6 * rec(n - 1) - 9 * rec(n - 2);
  15. 	}
  16. }
  17.  
  18. int main(void) {
  19. 	int n = 5;
  20. 	c = 0;
  21.  
  22. 	int result = rec(n);
  23.  
  24. 	printf("数列a%dの値は %d\n", n, result);
  25. 	printf("このときrecの呼び出し回数は %d\n", c);
  26.  
  27. 	return 0;
  28. }
  29.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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数列a5の値は -459
このときrecの呼び出し回数は 9
https://ideone.com/l9vgnT
language:
C (gcc 8.3)
created:
7 hours ago
visibility:
public

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