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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.  
  8.     if(n == 1)
  9.     {
  10.     	a=c;
  11.     }
  12.  
  13.    else if(n == 2)
  14.    {
  15.    	  a=b;
  16.    }
  17.  
  18.     else
  19.     for(i=3;i<=n;i++)
  20.     {
  21.     	a=-2*b+2*c;
  22.     	c=b;
  23.     	b=a;
  24.     }
  25.  
  26.    return a;
  27.  
  28. }
  29.  
  30. int main(void) {
  31. 	int n = 3;
  32.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  33. 	return 0;
  34. }
  35.  
Success #stdin #stdout 0s 5284KB
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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/XaF1cG
プログラミング2 第6回 練習問題G
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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