fork(1) download
copy 
  1. #include <stdio.h>
  2. int c = 0;   
  3. int rec(int n) {
  4.     c++;      
  5.  
  6.     if (n == 1) {
  7.         return 1;
  8.     }
  9.     else if (n == 2) {
  10.         return 2;
  11.     }
  12.     else {
  13.         return -6 * rec(n - 1) - 9 * rec(n - 2);
  14.     }
  15. }
  16.  
  17. int main(void) {
  18.     int n = 4;
  19.     printf("数列a%dの値は%d\n", n, rec(n));
  20.     printf("このときrecの呼び出し回数は%d\n", c);
  21.  
  22.     return 0;
  23. }
Success #stdin #stdout 0s 5328KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
数列a4の値は108
このときrecの呼び出し回数は5
https://ideone.com/oedSAu
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!