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  1. #include <stdio.h>
  2.  
  3. int c = 0;  
  4.  
  5.  
  6. int rec(int n) {
  7.     c++; 
  8.  
  9.     if (n == 1) return 1;
  10.     else if (n == 2) return 2;
  11.     else return -6 * rec(n - 1) - 9 * rec(n - 2);
  12. }
  13.  
  14. int main(void) {
  15.     int n = 4;
  16.     printf("数列a%dの値は%d\n", n, rec(n));
  17.     printf("recの呼び出し回数は%d回\n", c);
  18.     return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5312KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a4の値は108
recの呼び出し回数は5回
https://ideone.com/j0Xl3P
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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