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  1. #include <stdio.h>
  2.  
  3.  
  4. int rec(int n){
  5.     if (n == 1){
  6.         return 1;
  7.     }
  8.     else if (n == 2){
  9.         return 2;
  10.     }
  11.     else{
  12.         return rec(n - 2) + n;
  13.     }
  14. }
  15. int main(void) {
  16.     int n1 = 11;
  17.     printf("%d以下の正の奇数の和は%d\n", n1, rec(n1));
  18.  
  19.     int n2 = 10;
  20.     printf("%d以下の正の偶数の和は%d\n", n2, rec(n2));
  21.  
  22.     return 0;
  23. }
Success #stdin #stdout 0s 5320KB
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stdout
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11以下の正の奇数の和は36
10以下の正の偶数の和は30
https://ideone.com/csHZe4
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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