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  1. #include <stdio.h>
  2. // 練習問題G
  3. int func(int n) {
  4.     int a1 = 1; 
  5.     int a2 = 2;
  6.     int next;
  7.     int i;
  8.  
  9.     if (n == 1) return a1;
  10.     if (n == 2) return a2;
  11.  
  12.     for (i = 3; i <= n; i++) {
  13.         next = -2 * a2 + 2 * a1; 
  14.         a1 = a2;   
  15.         a2 = next; 
  16.     }
  17.  
  18.     return a2;
  19. }
  20.  
  21. int main(void) {
  22.     int n = 3;
  23.     printf("数列anについて、n=%dのときの値は%d\n", n, func(n));
  24.     return 0;
  25. }
Success #stdin #stdout 0.01s 5312KB
comments (?)
stdin 
Standard input is empty
stdout 
数列anについて、n=3のときの値は-2
https://ideone.com/61G6Yi
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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