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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.  
  22.     printf("数列a%dの値は%d\n", n, rec(n));
  23.     printf("このときrecの呼び出し回数は%d\n", c);
  24.  
  25.     return 0;
  26. }
Success #stdin #stdout 0s 5324KB
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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/iTpNnK
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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