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  1. #include <stdio.h>
  2. int main(void) {
  3.     int n;
  4.     scanf("%d",&n);
  5.     int an=2;
  6.     for(int i=0;i<n;i++){
  7.     	an=-2*an+4;
  8.     }
  9.     printf("数列a%dの値は%d\n", n,an);
  10.    	return 0;
  11. }
  12.  
  13.  
Success #stdin #stdout 0s 5320KB
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数列a1の値は0
https://ideone.com/OG1vGy
第5回　練習問題B　再起無
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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