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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 = 4;
  21.  
  22.     printf("数列a%dの値は%d\n", n, rec(n));
  23.     printf("recの呼び出し回数は%d回です\n", c);
  24.  
  25.     return 0;
  26. }
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
stdout
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数列a4の値は108
recの呼び出し回数は5回です
https://ideone.com/A4WKVh
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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