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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 == 1){
  5.         return 1;
  6.     }
  7.     else if (n == 2){
  8.     	return 2;
  9.     }
  10.     else{
  11.         return rec(n-2)+n;
  12.     }
  13. }
  14. int main(void) {
  15.     int n_kisu= 11;
  16.     int n_gusu = 12;
  17.     printf("%d以下の正の奇数の和は%d\n", n_kisu, rec(n_kisu));
  18.     printf("%d以下の世の偶数の和は%d\n", n_gusu, rec(n_gusu));
  19. 	return 0;
  20. }
Success #stdin #stdout 0s 5324KB
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11以下の正の奇数の和は36
12以下の世の偶数の和は42
https://ideone.com/qfhJRn
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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