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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4.  
  5. int func(int n){
  6.     if(n == 1) return 1;
  7.     if(n == 2) return 2;
  8.  
  9.     int a_n   = 1;  
  10.     int a_n1  = 2;  
  11.     int a_n2;       
  12.  
  13.     for(int i = 3; i <= n; i++){
  14.         a_n2 = -2 * a_n1 + 2 * a_n;  
  15.         a_n = a_n1;
  16.         a_n1 = a_n2;
  17.     }
  18.  
  19.     return a_n1;
  20. }
  21.  
  22. int main(void) {
  23.     int n = 3;
  24.     printf("数列a_nについて、n=%dのときの値は%d\n", n, func(n));
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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数列a_nについて、n=3のときの値は-2
https://ideone.com/etxbq2
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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