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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.     int i;
  7.     if (n == 1) {
  8.         return c;
  9.     }
  10.     if (n == 2) {
  11.         return b;
  12.     }
  13.  
  14.     for (i = 3; i <= n; i++) {
  15.         a = 2 * c - 2 * b;
  16.         c = b;
  17.         b = a;
  18.     }
  19.  
  20.     return a;
  21.  
  22. }
  23. int main(void) {
  24. 	int n = 3;
  25.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  26. 	return 0;
  27. }
  28.  
Success #stdin #stdout 0s 5316KB
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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/POW8Tl
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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