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  1. #include <stdio.h>
  2. //a{n+1} = -2a{n} + 4, a{0}=2(再帰あり版)
  3. int rec(int n){
  4. 	if(n==0){
  5. 		return 2;
  6. }else {
  7. 			return -2*rec(n-1)+4;
  8. 		}
  9. 	}
  10.  
  11.  
  12. int main(void) {
  13.     int n;
  14.     scanf("%d",&n);
  15.     printf("数列a%dの値は%d\n", n, rec(n));
  16.    	return 0;
  17. }
  18.  
  19.  
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin 
4
stdout 
数列a4の値は12
https://ideone.com/uAWMNa
language:
C (gcc 8.3)
created:
72 days ago
visibility:
public

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