因此，基本上我必须创建一个菜单，该菜单将要求用户选择食物，然后继续执行该操作，直到按下六个为止。另外，我必须总结用户必须付出的钱，并增加8％的税。这是格式 声明变量 输出菜单 循环启动（不要将菜单项编号用于循环条件） 询问物品编号 启动开关语句 每个案例应该看起来像这样 要求数量 确定订购商品的价格 累计账单小计 累计订购商品的总数量 默认案例声明-更改循环变量以打破循环 找出税收和总计 输出项目总数，小计，税项和总计
import java.util.Scanner;
public class lab8a{
public static void main(String[] args) {
// TODO Auto-generated method stub
//This is the menu that you choose from
Int sum=0;
System.out.println("1- Coffee and Donut- $3.50");
System.out.println("2- Coffee and Bagel- $3.75");
System.out.println("3- Coffee, Donut and Juice- $4.00");
System.out.println("4- 1/2 dozen donuts- $5.00");
System.out.println("5- 1 dozen donuts- $7.50");
Scanner input1= new Scanner(System.in);
System.out.print(“Enter 6 to exit or any other # to continue);
Int cont=input.nextInt();
System.out.print();
while(cont!=6){
Scanner input= new Scanner(System.in);//creates scanner for menu
System.out.println("choose the number of the order");//order based on
integer input
int menu= input.nextInt();
System.out.println();//prints out # chosen
double menu3= menu2;//switches the menu2 to a double to do math with decimals
switch (menu) {
case 1:
Scanner input2= new Scanner(System.in);//second scanner for quantity
System.out.println("How Many?");
int item1= input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item1+ " orders of coffee and donut for a total of $" + 3.50*item1);//prints out order and total
System.out.println("");
sum+=3.50*item1;
break;//break for cases
case 2:
Scanner input3= new Scanner(System.in);//second scanner for quantity
System.out.println("How Many?");
int item2= input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item2+ " orders of coffee and bagel for a total of $" + 3.75*item4);
System.out.println("");
s+=3.75*item2;
break;
case 3:
Scanner input4= new Scanner(System.in);//second scanner for quantity
System.out.println("How Many?");
int item3= input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item3+ " orders of Coffee, Donut, and Juice for a total of $" + 4.00*item3);
System.out.println("");
s+=4.00*item3
break;
case 4:
Scanner input5= new Scanner(System.in);//second scanner for quantity
System.out.println("How Many?");
int item4= input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item4+ " orders of 1/2 dozen donuts for a total of $" + 5.00*item4);
System.out.println("");
s+=5.00*item4;
break;
case 5:
Scanner input6= new Scanner(System.in);//second scanner for quantity
System.out.println("How Many?");
int item5= input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item5+ " orders of 1 dozen donuts for a total of $" + 7.00*item5);
System.out.println("");
s+=7.00*item5;
Break;
}
System.out.print(“Your subtotal is “ +sum);
System.out.println(“Your total is” + sum*1.08);
}
so what is supposed to happen is that I ask the user what they want to
order and continue asking them. Also I have to add up the price of the
orders and output the overall price when the user exits
答案 0 :(得分：0)
尝试一下：
import java.util.Scanner;
public class lab8a {
public static void main(String[] args) {
// TODO Auto-generated method stub
//This is the menu that you choose from
Scanner input = new Scanner(System.in);
double sum = 0;
int choice;
do{
System.out.println();
System.out.println("1- Coffee and Donut- $3.50");
System.out.println("2- Coffee and Bagel- $3.75");
System.out.println("3- Coffee, Donut and Juice- $4.00");
System.out.println("4- 1/2 dozen donuts- $5.00");
System.out.println("5- 1 dozen donuts- $7.50");
System.out.println("6- Exit");
choice = input.nextInt();
System.out.println("Your Choice is: "+choice);//prints out # chosen
switch (choice) {
case 1:
System.out.println("How Many?");
int item1 = input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item1 +
" orders of coffee and donut for a total of $" + 3.50 * item1);
//prints out order and total
System.out.println("");
sum += 3.50 * item1;
break;//break for cases
case 2:
System.out.println("How Many?");
int item2 = input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item2 + " orders of coffee and bagel for a total of $" + 3.75 * item2);
System.out.println("");
sum+= 3.75 * item2;
break;
case 3:
System.out.println("How Many?");
int item3 = input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item3 + " orders of Coffee, Donut, and Juice for a total of $" + 4.00 * item3);
System.out.println("");
sum+= 4.00 * item3;
break;
case 4:
System.out.println("How Many?");
int item4 = input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item4 + " orders of 1/2 dozen donuts for a total of $" + 5.00 * item4);
System.out.println("");
sum+= 5.00 * item4;
break;
case 5:
System.out.println("How Many?");
int item5 = input.nextInt();
System.out.println();//prints out # of orders
System.out.print("You are ordering " + item5 + " orders of 1 dozen donuts for a total of $" + 7.50 * item5);
System.out.println("");
sum+= 7.50 * item5;
break;
}
System.out.println("Your subtotal is " + sum);
System.out.println("Your total is " + sum * 1.08);
}while (choice!=6);
}
}