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  1. #include <stdio.h>
  2. //a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
  3. int rec(int n){
  4. 	int a;
  5. 	if(n == 1)return 1;
  6. 	else if(n == 2)return 2;
  7. 	else {
  8. 		a = -6*rec(n-1) -9*rec(n-2);
  9. 	}return a;
  10. }
  11.  
  12. int main(void) {
  13.     int n = 4;
  14.     printf("数列a%dの値は%d\n", n, rec(n));
  15. 	return 0;
  16. }
  17.  
  18.  
Success #stdin #stdout 0.01s 5324KB
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Standard input is empty
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数列a4の値は108
https://ideone.com/Swx55E
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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