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  1. #include <stdio.h>
  2. int c=0;
  3. int rec(int n) {
  4.     c++;
  5.  
  6.     if (n==1)
  7.         return 1;
  8.     else if (n==2)
  9.         return 2;
  10.     else
  11.         return -6*rec(n-1)-9*rec(n-2);
  12. }
  13.  
  14. int main(void) {
  15.     int n=5;   
  16.  
  17.     c=0;       
  18.     printf("数列a%dの値は%d\n", n, rec(n));
  19.     printf("このときrecの呼び出し回数は%d\n", c);
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 5320KB
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Standard input is empty
stdout
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数列a5の値は-459
このときrecの呼び出し回数は9
https://ideone.com/cYyYo2
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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