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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){
  9.         return 1;
  10.     }
  11.     else if(n == 2){
  12.         return 2;
  13.     }
  14.     else{
  15.         return -6*rec(n-1) -9*rec(n-2);
  16.     }
  17. }
  18.  
  19. int main(void) {
  20.     int n = 5;
  21.     printf("数列a%dの値は%d\n", n, rec(n));
  22.     printf("recが呼び出された回数: %d回\n", c);  
  23.     return 0;
  24. }
  25.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a5の値は-459
recが呼び出された回数: 9回
https://ideone.com/mXLEYB
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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