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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.     if(n==1){
  5.        return 1;
  6.     }
  7.     else if(n==2){
  8.        return 2;
  9.     }
  10.     else{
  11.        return -6*rec(n-1) - 9*rec(n-2);
  12.     }
  13. }
  14.  
  15. int main(void) {
  16.     int n = 4;
  17.     int an = 1;
  18. 	for(int i=1;i<=n;i++){
  19.     printf("数列a%dの値は%d\n", i, rec(i));
  20. 	}
  21. 	return 0;
  22. }
  23.  
  24.  
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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数列a1の値は1
数列a2の値は2
数列a3の値は-21
数列a4の値は108
https://ideone.com/3dwMbJ
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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