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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.     else if (n==2){
  8.         return 2;}
  9.     else {
  10.         return -6*rec(n-1)-9*rec(n-2);}
  11. }
  12. int main(void){
  13.     int n=5;
  14.     int a=rec(n);
  15.     printf("数列a%dの値は%d\n",n,a);
  16.     printf("このときrecの呼び出し回数は%d\n",c);
  17.     return 0;
  18. }
Success #stdin #stdout 0s 5324KB
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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
このときrecの呼び出し回数は9
https://ideone.com/DbhAxj
language:
C (gcc 8.3)
created:
17 hours ago
visibility:
public

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