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  1. #include <stdio.h>
  2. //練習問題E
  3.  
  4. int tri (int a)
  5. {
  6. if(a==0)
  7. { return 0;
  8. }
  9. else if(a==1)
  10. {return 0;}
  11.  
  12. else if(a==2)
  13. {return 1;}
  14.  
  15. else
  16. {return tri(a-1)+tri(a-2)+tri(a-3);}
  17. }
  18.  
  19.  
  20. int main(void) {
  21. 	int n = 7;
  22.     printf("数列Tnについて, n=%dのときの値は%d\n", n, tri(n));
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5324KB
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Standard input is empty
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数列Tnについて, n=7のときの値は13
https://ideone.com/O1GlDi
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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