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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.     else{
  12.     	if(n==1){
  13.     		return 1;
  14.     	}
  15.         else{
  16.         	return rec(n-2)+n;
  17.  
  18.         }
  19.  
  20.     }
  21.  
  22.     }
  23.  
  24. int main(void) {
  25.     int n = 11;
  26.     printf("%d以下の正の奇数の和は%d\n", n, rec(n));
  27. 	return 0;
  28. }
Success #stdin #stdout 0s 5284KB
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11以下の正の奇数の和は36
https://ideone.com/uCeIKO
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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