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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.     else if(n==2)
  10.     return b;
  11.     else
  12.     for(i=3;i<=n;i++){
  13.     	a=2*c-2*b;
  14.     	c=b;
  15.     	b=a;
  16.     }
  17.     return a;
  18.  
  19.  
  20. }
  21. int main(void) {
  22. 	int n = 3;
  23.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  24. 	return 0;
  25. }
  26.  
Success #stdin #stdout 0.01s 5268KB
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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/63YIA8
language:
C (gcc 8.3)
created:
18 days ago
visibility:
public

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