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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 1;
  9.     }else if(n==2){
  10.     	return 2;
  11.     }else{
  12.     	for(i=3;i<=n;i++){
  13.         a=-2*b+2*c;
  14.         c=b;
  15.         b=a;
  16.     }
  17.     }
  18.      return a;
  19. }
  20. int main(void) {
  21. 	int n = 3;
  22.     printf("数列anについて, n=%dのときの値は%d\n", n, func(n));
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5304KB
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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/1mLA08
language:
C (gcc 8.3)
created:
20 hours ago
visibility:
public

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