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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.     }
  7.     else{
  8.            return -2*rec(n-1)+4;
  9.     }
  10. }
  11. int main(void) {
  12.     int n=5;
  13.     //int m;
  14.     //scanf("%d",&n);
  15.     //scanf("%d",&m);
  16.     for(int i=1;i<=n;i++){
  17.     printf("数列a%dの値は%d\n", i, rec(i));
  18.     //printf("数列a%dの値は%d\n", m, rec(m));
  19.    	}
  20. 	return 0;
  21. }
  22.  
  23.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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5
8
stdout
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数列a1の値は0
数列a2の値は4
数列a3の値は-4
数列a4の値は12
数列a5の値は-20
https://ideone.com/W57PkH
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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