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  1. #include <stdio.h>
  2.  
  3. int c = 0;
  4.  
  5. int rec(int n) {
  6.     c++;
  7.  
  8.     if (n == 1) return 2;
  9.     if (n == 2) return 3;
  10.  
  11.     return -3*rec(n-1) - 3*rec(n-2);
  12. }
  13.  
  14. int main(void) {
  15.     int n = 5;
  16.     int a = rec(n);
  17.  
  18.     printf("数列a%dの値は%d\n", n, a);
  19.     printf("このときrecが呼び出し回数は%d回です。\n", c);
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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数列a5の値は-63
このときrecが呼び出し回数は9回です。
https://ideone.com/UpDpt1
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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