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  1. #include <stdio.h>
  2.  
  3. int c = 0;
  4.  
  5. int rec(int n){
  6.     c++; 
  7.     if(n == 1){
  8.         return 1;
  9.     }
  10.     else if(n == 2){
  11.         return 2;
  12.     }
  13.     else{
  14.         return -6 * rec(n - 1) - 9 * rec(n - 2);
  15.     }
  16. }
  17.  
  18. int main(void){
  19.     int n;
  20.     scanf("%d", &n);
  21.     printf("a%dの値は %d\n", n, rec(n));
  22.     printf("rec関数の呼び出し回数 %d回\n", c);
  23.  
  24.     return 0;
  25. }
Success #stdin #stdout 0.01s 5296KB
comments (?)
stdin 
5
stdout 
a5の値は -459
rec関数の呼び出し回数 9回
https://ideone.com/MJYIF3
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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