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  1. //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 偶数は偶数の和
  2. #include <stdio.h>
  3.  
  4. int rec(int n) {
  5.     if (n<=0) {
  6.         return 0;          
  7.     }
  8.     return n + rec(n - 2); 
  9. }
  10.  
  11. int main(void) {
  12.     int n = 11;
  13.     if (n % 2 == 1) {
  14.         printf("%d以下の正の奇数の和は%d\n", n, rec(n));
  15.     } else {
  16.         printf("%d以下の正の偶数の和は%d\n", n, rec(n));
  17.     }
  18.     return 0;
  19. }
Success #stdin #stdout 0s 5320KB
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11以下の正の奇数の和は36
https://ideone.com/gd0AkX
language:
C (gcc 8.3)
created:
17 hours ago
visibility:
public

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