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  1. #include <stdio.h>
  2.  
  3. int rec (int n){
  4. if(n==1){return 1;}
  5. else if(n==2){return 2;}
  6. else{return -6*rec(n-1) -9*rec(n-2);}}
  7.  
  8. int main (void){
  9. 	int n=4;
  10. 	printf("数列のa%dの値は%d\n",n,rec(n));
  11. 	return 0;
  12. }
  13.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
数列のa4の値は108
https://ideone.com/5ZSx7F
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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