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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 == 0){
  8.     	return 0;
  9.     }
  10.     else{
  11.         return rec(n-2)+n;
  12.     }
  13. }
  14. int main(void) {
  15.     int n = 13;
  16.     if(n%2 !=  0)
  17.     printf("%d以下の正の奇数の和は%d\n", n, rec(n));
  18.     else if(n%2 == 0)
  19.     printf("%d以下の正の偶数の和は%d\n", n, rec(n));
  20. 	return 0;
  21.  
  22. }
Success #stdin #stdout 0.01s 5320KB
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13以下の正の奇数の和は49
https://ideone.com/TpnRI5
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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