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  1. #include <stdio.h>
  2. //練習問題G
  3. int func(int n){
  4. 	int a1=1,a2=2,an;
  5. 	int i;
  6.  
  7. 	if(n==1)return a1;
  8. 	if(n==2)return a2;
  9.  
  10. 	for(i=3;i<=n;i++){
  11. 		an=-2*a2+2*a1;
  12. 		a1=a2;
  13. 		a2=an;
  14. 	}
  15. 	return an;
  16. }
  17. int main(void) {
  18. 	int n = 3;
  19.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0.01s 5292KB
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Standard input is empty
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数列anについて, n=3のときの値は-2
https://ideone.com/ug2KuL
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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