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  1. #include <stdio.h>
  2. //練習問題E
  3. int tri(int n) { 
  4. 	if (n == 0) {
  5. 		return 0; 
  6. 	} 
  7. 	else if (n == 1) {
  8. 		return 0;
  9. 	}
  10. 	else if (n == 2) {
  11. 		return 1;
  12. 	}
  13. 	else {
  14. 		return tri(n - 1) + tri(n - 2) + tri(n - 3);
  15. 	}
  16. }
  17.  
  18. int main(void) {
  19. 	int n = 7;
  20.     printf("数列Tnについて, n=%dのときの値は%d\n", n, tri(n));
  21. 	return 0;
  22. }
Success #stdin #stdout 0s 5324KB
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数列Tnについて, n=7のときの値は13
https://ideone.com/cxpa9H
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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