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  1. #include <stdio.h>
  2.  
  3. int rec(int n)
  4. {
  5. 	if (n % 2 == 0){
  6. 		return rec(n - 3) + (n - 1);
  7. 	}
  8.  
  9.     else if (n == 1) {
  10.         return 1;
  11.     }
  12.     else {
  13.         return rec(n - 2) + n;
  14.     }
  15. }
  16.  
  17. int main(void)
  18. {
  19.     int n = 7;
  20.     printf("%d以下の正の奇数の和は%d\n", n, rec(n));
  21.  
  22.     return 0;
  23. }
Success #stdin #stdout 0s 5308KB
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Standard input is empty
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7以下の正の奇数の和は16
https://ideone.com/hXNB7e
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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