流程控制语句加深练习题

嵌套加深练习题：
 代码量较大所以直接copy过来就不发图了（抱歉）
 import java.util.Scanner;//导包
 public class TextShopping{	public static void main(String[] args){	
 System.out.println("***********************************************");	
 System.out.println("请选择购买的商品编号：");	
 System.out.println("1.T恤t2.网球鞋t3.网球拍");	
 System.out.println("***********************************************");		
 Scanner sc = new Scanner(System.in);	
 String flag = "y";	
 //存储商品编号的变量	
 int pId = 0;
 	//存储购买数量的变量	
 	int num = 0;	
 	//T恤的单价	
 	double tPrice = 245.0;
 		//网球鞋的单价	
 		double wqxPrice = 570.0;	
 		//网球拍的单价	double pPrice = 320.0;	
 		//每次购买商品的总价；
 			double oneTotalPrice = 0;	
 			//定义一个计算购买商品总额的变量	
 			double totalPrice = 0;		while("y".equals(flag)){		System.out.println();		
 			System.out.println("请输入商品编号：");		pId = sc.nextInt();		
 			System.out.println("请输入购买数量：");		num = sc.nextInt();		
 					switch(pId){		
 						case 1:		
 							oneTotalPrice = tPrice*num;			
 							System.out.println("T恤 ￥"+tPrice+"t"+"数量 "+num+"t"+"合计 ￥"+oneTotalPrice);		
 								totalPrice += oneTotalPrice;			oneTotalPrice = 0;			break;		
 				      	case 2:		
 				      		oneTotalPrice = wqxPrice*num;			
 				      		System.out.println("网球鞋 ￥"+wqxPrice+"t"+"数量 "+num+"t"+"合计 ￥"+oneTotalPrice);		
 				      			totalPrice += oneTotalPrice;			oneTotalPrice = 0;			break;		
 				      	case 3:			
 				      	oneTotalPrice = pPrice*num;			
 				      	System.out.println("网球拍 ￥"+pPrice+"t"+"数量 "+num+"t"+"合计 ￥"+oneTotalPrice);		
 				      		totalPrice += oneTotalPrice;			oneTotalPrice = 0;			break;		}		
 System.out.println("y/n");	
 			flag = sc.next();	}		
 			System.out.println();		    
 			System.out.print("折扣：");	
 				//定义折扣变量		
 				double zk = sc.nextDouble();		  
 				totalPrice *= zk;		
 				System.out.println("应付金额：" +  totalPrice);		
 				//定义实付变量		
 				System.out.print("实付金额：");		double sf = sc.nextDouble();		
 				if(sf < totalPrice){			System.out.print("您输入的金额小于应付金额，请重新输入：");	
 					sf = sc.nextDouble();		}	System.out.println("找钱："+ (sf-totalPrice));		}	}