import java.util.*;
public class Goods {
    String[] goods=new String[]{"電風扇","洗衣機","電視機","冰箱","空調機"};
    double[] price=new double[]{124.23,4500,8800.90,5000.88,4456,1200.46};
   
    double total;
    public boolean login(){
    	boolean flag=false;
    	Scanner input=new Scanner(System.in);
    	System.out.print("請輸入使用者名稱: ");
    	String name=input.next();
    	System.out.print("請輸入密碼: ");
    	String pwd=input.next();
    	if(name.equals("Tom")&&pwd.equals("123")){
    		System.out.println("登入成功");
    		flag=true;
    	}else{
    		System.out.println("請重新登入");
    		
    	}
    	return flag;
    }
     public StringBuffer change(double d){
    	StringBuffer str=new StringBuffer(String.valueOf(d));
    	for(int i=str.indexOf(".")-3;i>0;i=i-3){
    		str.insert(i, ',');
    	}
    	return str;
    }
    
    public void show(){
    	Scanner input=new Scanner(System.in);
    	System.out.println("*********歡迎進入商品批發城*********");
    	System.out.println("\t編號\t商品\t價格");
    	for(int i=0;i<goods.length;i++){
    		System.out.println("\t"+(i+1)+"\t"+goods[i]+"\t"+change(price[i]));
    	}
    	System.out.println("************************************");
    	System.out.print("請輸入您批發的商品編號: ");
    	int choice=input.nextInt();
    	System.out.print("請輸入批發數量: ");
    	int number=input.nextInt();
    	switch(choice){
    	case 1:
    		total=price[0]*number;
    		break;
    	case 2:
    		total=price[1]*number;
    		break;
    	case 3:
    		total=price[2]*number;
    		break;
    	case 4:
    		total=price[3]*number;
    		break;
    	case 5:
    		total=price[4]*number;
    		break;
    	}
    	System.out.println("您需要付款:"+change(total));
    }
    
   
    
    public static void main(String[] args) {
    	Goods g=new Goods();
    	
    	g.login();
    	g.show();
	}
}