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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%2 == 0) {
  5.    if (n==2) {
  6.       return 2; 
  7. 		} else {
  8.             return n+rec(n-2);
  9.         }
  10.     } 
  11.  
  12.     else {
  13.         if (n==1) {
  14.             return 1;
  15.         } else {
  16.             return n+rec(n-2);
  17.         }
  18.     }
  19. }
  20. int main(void) {
  21.     int n = 6;
  22.     printf("%d以下の正の偶数の和は%d\n", n, rec(n));
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 5320KB
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6以下の正の偶数の和は12
https://ideone.com/pf2qCf
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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