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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 n=n-1+n-2+n-3;
  15. 	}
  16. }
  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 0.01s 5292KB
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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15
https://ideone.com/cNpCGA
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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