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  1. #include <stdio.h>
  2. //正の数nを引数とし，以下の正の奇数または偶数の和を求める関数
  3. int rec(int n){
  4.     if (n == 1){
  5.         return 1;
  6.     }else if(n == 2){
  7.     	return 2;
  8.     }
  9.     else{
  10.         return n+rec(n-2);
  11.     }
  12. }
  13. int main(void) {
  14.     int n = 12;
  15.     if(n%2==1){
  16.     	printf("%d以下の正の奇数の和は%d\n", n, rec(n));
  17.     }else if(n%2==0){
  18.     	printf("%d以下の正の偶数の和は%d\n", n, rec(n));
  19.     }
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 5312KB
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12以下の正の偶数の和は42
https://ideone.com/aUA46k
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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