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  1. #include <stdio.h>
  2. int c = 0;   // グローバル変数
  3.  
  4. int rec(int n){
  5.     c++;      // recが呼ばれるたびに1増やす
  6.  
  7.     if(n == 1)
  8.         return 1;
  9.     else if(n == 2)
  10.         return 2;
  11.     else
  12.         return -6 * rec(n - 1) - 9 * rec(n - 2);
  13. }
  14.  
  15. int main(void){
  16.  
  17.     int n = 5;
  18.  
  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 0.01s 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/GOZmW5
language:
C (gcc 8.3)
created:
18 hours ago
visibility:
public

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