java - 如何在Java订购系统中计算总价？

我只是大一学生，我的项目正在创建一个订购系统，但由于无法正确执行总价，因此我坚持定价。当程序循环时，它计算出错误的价格。我输入的唯一选择是A1和A2，因为这仍然是一个未完成的项目。

import java.io.*;
public class Ordering_System
{
     public static void main(String []args) throws Exception
     {
         BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
         String order,again;
         int quantity,price1=0,price2=0,loop1=0,quantity1,quantity2=0;

         System.out.println("  ");

         System.out.println("Welcome to MgRonalds, What do you want to order?");

         System.out.println(" ");
         System.out.println("*******************************************************************");
         System.out.println("*   Code    Meal             ''MENU''              Price          *");
         System.out.println("*                                                                 *");
         System.out.println("*   (A1)   MgBurger                                P30.00         *");
         System.out.println("*   (A2)   Big Mac                                 P139.00        *");
         System.out.println("*   (B1)   Cheese Burger                           P35.00         *");
         System.out.println("*   (B2)   Chicken Burger                          P50.00         *");
         System.out.println("*   (C1)   MgNuggets                               P65.00         *");
         System.out.println("*   (C2)   MgChicken                               P79.00         *");
         System.out.println("*   (D1)   MgSpagetti                              P60.00         *");
         System.out.println("*   (D2)   MgFries                                 P40.00         *");
         System.out.println("*   (E1)   Coke                                    P10.00         *");
         System.out.println("*   (E2)   Sprite                                  P10.00         *");
         System.out.println("*   (E3)   Royal                                   P10.00         *");
         System.out.println("*   (F1)   Sundae                                  P25.00         *");
         System.out.println("*   (F2)   MgFloat                                 P25.00         *");
         System.out.println("*                                                                 *");
         System.out.println("*******************************************************************");

         do{
            System.out.println("");
            System.out.print("Enter Code Order      : ");
            order=br.readLine();
            if (order.equalsIgnoreCase("A1")) {
                price1=30;
                System.out.println("Order Description     : MgBurger ");
            } else if (order.equalsIgnoreCase("A2")) {
                price1=139;
                System.out.println("Order Description     : Big Mac ");
            }

            System.out.print("Enter Quantity        : ");
            quantity1= Integer.parseInt(br.readLine());
            quantity2=quantity1+quantity2;

            price2=price1*quantity2;

            System.out.print("Another Order?  (Y/N) : ");
            again=br.readLine();
            if (again.equalsIgnoreCase("y"))
                loop1=loop1+1;
            else loop1=loop1-100;
      } while (loop1==1);

     System.out.println(" ");
     System.out.println("Total Price           : "+price2);

 }
}

这是一个示例输出：

Enter Code Order      : a1
Order Description     : MgBurger
Enter Quantity        : 2
Another Order?  (Y/N) : y

Enter Code Order      : a2
Order Description     : Big Mac
Enter Quantity        : 2
Another Order?  (Y/N) : n

Total Price           : 556

答案应该是338而不是556

最佳答案

你简单地做到这一点呢？
添加变量total =0;

  System.out.print("Enter Quantity        : ");
  quantity1 = Integer.parseInt(br.readLine());
  // quantity2=quantity1+quantity2;

  // price2=price1*quantity2;

  total += price1 * quantity1;

  ...
  System.out.println(" ");
  System.out.println("Total Price           : " + total);

关于java - 如何在Java订购系统中计算总价？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/26187920/