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  1. //練習問題A(再帰あり),練習問題B
  2. #include <stdio.h>
  3. //a{n+1}=-2a{n}+4,a{0}=2
  4. int rec(int n){
  5. 	if(n==0){
  6. 		return 2;
  7. 	}
  8. 	else{
  9. 		return -2*rec(n-1)+4;
  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.  
Success #stdin #stdout 0s 5316KB
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5
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数列a5の値は-20
https://ideone.com/qlY0Du
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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