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  1. #include <stdio.h>
  2. //練習問題G
  3.  
  4.  
  5. #include <stdio.h>
  6.  
  7. int main(void) {
  8.     int n = 3;
  9.  
  10.     if(n == 1){
  11.         printf("数列a_nについて、n=%dのときの値は%d\n", n, 1);
  12.         return 0;
  13.     }
  14.     if(n == 2){
  15.         printf("数列a_nについて、n=%dのときの値は%d\n", n, 2);
  16.         return 0;
  17.     }
  18.  
  19.     int a_n   = 1;  
  20.     int a_n1  = 2;  
  21.     int an;       
  22.  
  23.     for(int i = 3; i <= n; i++){
  24.         an = -2 * a_n1 + 2 * a_n;  
  25.         a_n = a_n1;
  26.         a_n1 = an;
  27.     }
  28.  
  29.     printf("数列a_nについて、n=%dのときの値は%d\n", n, a_n1);
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 5316KB
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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/o5bcxA
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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