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  1. #include <stdio.h>
  2.  
  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 = 11;
  16.     if(n%2==1){
  17.     	printf("%d以下の正の奇数の和は%d\n", n, rec(n));
  18.  
  19.     }
  20.     else if(n%2==0){
  21.     	printf("%d以下の正の偶数の和は%d\n",n,rec(n));
  22.     }
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 5316KB
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11以下の正の奇数の和は36
https://ideone.com/Op7owf
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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