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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. int main(void) {
  11.     int n;
  12.     scanf("%d",&n);
  13.     printf("数列a%dの値は%d\n", n, rec(n));
  14.    	return 0;
  15. }
  16.  
  17.  
Success #stdin #stdout 0.01s 5284KB
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数列a3の値は-4
https://ideone.com/Clvwma
language:
C (gcc 8.3)
created:
73 days ago
visibility:
public

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