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  1. #include <stdio.h>
  2. //課題1
  3. //a{n} = 2a{n-1} + a{n-2}, a{1}=2, a{2}=3(再帰なし版)
  4.  
  5. int main(void) {
  6.     int n = 4;
  7.     int a, b = 3, c = 2; 
  8.     for(int i = 3; i <= n; i++){
  9.         a = 2*b + c;
  10. //b = a, c = b が逆
  11.         c = b;
  12.         b = a;
  13.     }
  14.     printf("数列a%dの値は%d\n", n, a);
  15. 	return 0;
  16. }
  17.  
  18.  
Success #stdin #stdout 0s 5328KB
comments (?)
stdin 
Standard input is empty
stdout 
数列a4の値は19
https://ideone.com/mZse7C
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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