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  1. #include <stdio.h>
  2. int tri(int n){
  3. if(n==0)
  4. {
  5. return 0;
  6. }
  7. else if(n==1)
  8. {
  9. return 0;
  10. }
  11. else if(n==2)
  12. {
  13. return 1;
  14. }
  15. else
  16. {
  17. return (n-1)+(n-2)+(n-3);
  18. }
  19.  
  20. }
  21.  
  22.  
  23.  
  24.  
  25. int main(void) {
  26. 	int n = 7;
  27.     printf("数列Tnについて, n=%dのときの値は%d\n", n, tri(n));
  28. 	return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5320KB
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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/j1nKdu
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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