java程式設計題目---公式計算【費式數列】

設計一程式，提示使用者輸入正整數n，計算第n項之費式數列

import java.util.Scanner;

public class C1 
{
 public static void main(String[] args) 
 {
  Scanner input = new Scanner(System.in);
  
  System.out.println("請輸入第n項費式數列:");
  int number = input.nextInt();
  int numbernew = number - 2;
  int first = 1;
  int second = 0;
  int sum = 0;  
  
  for(int i = 1 ;  i <= numbernew  ; i ++ )
  {
   sum = first + second;
   second = first;
   first = sum;  
  }
  
  if(number == 1 )
  {
   System.out.println("第1項之費式級數為:0");
  }
  else if( number == 2 )
  {
   System.out.println("第2項之費式級數為:1");
  }
  else
  {
   System.out.println("第" + number + "項之費式級數為:" + sum);
  }  
 }
}