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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4. int func(int n){
  5.     int a=1,b=2,c;
  6.     int i;
  7.     if (n == 1) return a;
  8.     if (n == 2) return b;
  9.  
  10.     for (i = 3; i <= n; i++) {
  11.         c = -2 * b + 2 * a;
  12.         a = b;
  13.         b = c;
  14.     }
  15.     return c;
  16. }
  17.  
  18. int main(void) {
  19. 	int n = 3;
  20.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5320KB
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数列anについて, n=3のときの値は-2
https://ideone.com/gnr1Vp
language:
C (gcc 8.3)
created:
16 days ago
visibility:
public

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