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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4. int func(int n){
  5.     int a, b=2, c=1;
  6.     if(n<=2) return n;
  7.     int i;
  8.     for(i=2; i<n; i++){
  9.     	a = -2*b + 2*c;
  10.     	c = b;
  11.     	b = a;
  12.     }
  13.     return a;
  14.  
  15.  
  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 0s 5284KB
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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/2XFk5J
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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