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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==0){
  5. return 0;}
  6.  
  7.  
  8.     if (n == 1){
  9.         return 1;
  10.     }
  11. if (n%2==0)
  12. {
  13. return n+rec(n-2);
  14. }
  15.     else{
  16.         return n+rec(n-2);
  17.     }
  18. }
  19. int main(void) {
  20.     int n = 6;
  21. printf("rec(%d)",n);
  22.  
  23.  
  24. for(n; n>0; n=n-2)
  25. {printf("%d+",n);
  26. }
  27. printf("=%d",rec(n));
  28. }
  29.  
  30.  
  31.  
  32.  
  33.  
  34.  
  35.  
Success #stdin #stdout 0s 5324KB
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stdin
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Standard input is empty
stdout
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rec(6)6+4+2+=0
https://ideone.com/oWldxr
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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