//  程序設計方法學第二次作業(yè)    
//  信研0802  何榮波   2008000732
//  30/10/2008


import java.util.Scanner;

public class Post 
{
	public static void main(String[] args)
	{
		String replay;
		String c;    //商品名稱
		float p;	 //商品單價
		int n;		 //商品數(shù)量
		float mon = 0;		//用來保存每件商品價錢
		float sum = 0;		//用來保存商品總價錢
		float cost;			//實際支付金額
		float ret;
		int i =0;
		int m =0;
		
		Scanner in = new Scanner(System.in);
		
		ShuZu shuzu = new ShuZu(100);
		Calculation cal = new Calculation();

		do
		{			
			//	輸入商品名		
			System.out.print("請輸入商品名: ");
			c = in.next();
			
			//	輸入商品單價		
			System.out.print("請輸入商品單價: ");
			p =in.nextFloat();
			
			//	輸入商品數(shù)量
			System.out.print("請輸入商品數(shù)量");
			n = in.nextInt();			
		
			shuzu.setShuZu(i, c, p, n);
			mon = cal.product(shuzu.getPrice(i), shuzu.getNumber(i));
			System.out.println(shuzu.getName(i)+"---"+shuzu.getPrice(i)+"---"+shuzu.getNumber(i)+"     "+mon);
			
			sum = cal.add(sum, cal.product(shuzu.getPrice(i), shuzu.getNumber(i)));		
						
			m = ++i;;
	
			//  判斷是否繼續(xù)輸入商品信息
			System.out.print("退出請按 Q ,其它任意健繼續(xù)");
			replay = in.next();	
		}	while(replay.equals("q") == false);
		
		System.out.println();
		System.out.println();
		
//  打印商品列表
		for(int j = 0; j < m; j++)
		{
			System.out.println(shuzu.getName(j)+"---"+shuzu.getPrice(j)+"---"+shuzu.getNumber(j));
		}
		System.out.println("         總計--------"+sum);
		
//	輸入實際支付金額
		System.out.print("請輸入金額:   ");
		cost = in.nextInt();
		System.out.println(cost);
		
//  找零
		ret = cal.sub(cost, sum);
		System.out.println("         應找--------"+ret);
	}
}



//  定義存儲數(shù)據(jù)信息的數(shù)組類
class ShuZu
{
	private String[] name;
	private Float[] price;
	private int[] number;
	

	
	public ShuZu(int length)
	{
		name = new String[length];
		price = new Float[length];
		number = new int[length]; 
		
	}
	
	public void setShuZu(int i,String c,Float p,int n)
	{
		name[i] = c;
		price[i] = p;
		number[i] = n;
	}
	
	public String getName(int i)
	{
		return name[i];
	}
	
	public Float getPrice(int i)
	{
		return price[i];
	}
	
	public int getNumber(int i)
	{
		return number[i];
	}	
}


//  定義計算類
class Calculation
{
	public Calculation()
	{
		
	}
	
	public float product(float p, int n)
	{
		return p * n;
	}
	
	public float add(float a, float b)
	{
		return a + b;
	}
	
	public float sub(float a, float b)
	{
		return a - b;
	}
}