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  1. #include <stdio.h>
  2.  
  3.  
  4. int c = 0;
  5.  
  6.  
  7.  
  8. int rec(int n){
  9.     c++;
  10.  
  11.     if (n == 1){
  12.         return 1;
  13.     }
  14.     else if (n == 2){
  15.         return 2;
  16.     }
  17.     else{
  18.         return -6 * rec(n - 1) - 9 * rec(n - 2);
  19.     }
  20. }
  21.  
  22. int main(void){
  23.     int n = 5;
  24.  
  25.     printf("数列a%dの値は%d\n", n, rec(n));
  26.     printf("recの呼び出し回数は%d回です\n", c);
  27.  
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5328KB
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stdin
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Standard input is empty
stdout
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数列a5の値は-459
recの呼び出し回数は9回です
https://ideone.com/4cb74T
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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