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  1. #include <stdio.h>
  2. int c = 0;
  3. int rec(int n){
  4.      c++;
  5.     if(n == 1){
  6.         return 1;
  7.     }
  8.     else if (n == 2){
  9.         return 2;
  10.     }
  11.     else{
  12.         return -6*rec(n-1) -9*rec(n-2);
  13.     }
  14. }
  15.  
  16. int main(void) {
  17.     int n = 5;
  18.     int result = rec(n);
  19.     printf("数列のa%dの値は%d\n", n, result);
  20.     printf("rec関数の呼び出し回数: %d回\n", c);
  21.  
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 5308KB
comments (?)
stdin 
Standard input is empty
stdout 
数列のa5の値は-459
rec関数の呼び出し回数: 9回
https://ideone.com/Ofjrjj
language:
C (gcc 8.3)
created:
17 hours ago
visibility:
public

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