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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. 	}
  7.     else{	
  8. 		return -2*rec(n-1)+4;
  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 0s 5316KB
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stdin
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4
stdout
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数列a4の値は12
https://ideone.com/29vXeX
language:
C (gcc 8.3)
created:
12 hours ago
visibility:
public

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