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  1. #include <stdio.h>
  2.  
  3. // 課題2
  4.  
  5. int c = 0;  
  6.  
  7. int rec(int n){
  8.     c++;  
  9.  
  10.     if(n == 1){
  11.         return 1;
  12.     }
  13.     else if(n == 2){
  14.         return 2;
  15.     }
  16.     else{
  17.         return -6*rec(n-1) - 9*rec(n-2);
  18.     }
  19. }
  20.  
  21. int main(void){
  22.     int n = 5;
  23.  
  24.     printf("数列a%dの値は%d\n", n, rec(n));
  25.     printf("このときrecの呼び出し回数は%d\n", c);
  26.  
  27.     return 0;
  28. }
  29.  
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
このときrecの呼び出し回数は9
https://ideone.com/kvYr1H
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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