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  1. #include <stdio.h>
  2. //正の奇数nを引数とし，以下の正の奇数の和を求める関数
  3. int rec(int n){
  4. if(n==0){
  5. return 0;}
  6.  
  7.  
  8.     if (n == 1){
  9.         return 1;
  10.     }
  11. if (n%2==0)
  12. {
  13. return n+rec(n-2);
  14. }
  15.     else{
  16.         return n+rec(n-2);
  17.     }
  18. }
  19. int main(void) {
  20.     int n = 6;
  21. if(n%2==0)
  22. {printf("%d以下の正の偶数の和は%d\n", n, rec(n));}
  23. else{
  24.     printf("%d以下の正の奇数の和は%d\n", n, rec(n));
  25. }
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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6以下の正の偶数の和は12
https://ideone.com/0o7rIe
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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