Java 零售价格总误差

为什么当我打印出整个销售总额和零售价格总额时，它不会给出正确的答案？我的方程式错了吗

public class RetailPrice {

    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        int NumofItems;
        int items;
        double WS = 0;
        double MP = 0;
        double RP;
        RP = (WS + (MP * WS));
        System.out.println("How many items do you want to process?: ");
        NumofItems = keyboard.nextInt();
        for (items = 1; items <= NumofItems; items++) {
            System.out.println("Enter the wholesale price of item " + items);
            WS = keyboard.nextDouble();
            System.out.println("Enter the markup percentage for item: " + items);
            MP = keyboard.nextDouble();
            System.out.printf("The retail price of item " + items + " is $%.2f" + (WS + (MP * WS)));
            System.out.println();
        }
        double totalWP = 0;
        totalWP = totalWP + WS;
        System.out.println("Total wholesale price for the " + items + " items is " + totalWP);
        double totalRP;
        totalRP = RP * NumofItems;
        System.out.println("Total retail price for the " + items + " items is " + totalRP);
    }
}

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我已经移动了一些行以获得您想要的功能。我们还可以做很多其他的改进，但是首先需要处理逻辑

尝试运行此代码，并特别注意我移动的行。标记为//***想想我为什么会移动它们，它们在你放它们的地方做了什么，它们在我放它们的地方做了什么

import java.util.Scanner;

public class RetailPrice {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        int NumofItems;
        int items;
        double WS = 0;
        double MP = 0;
        double RP;

        System.out.println("How many items do you want to process?: ");
        NumofItems = keyboard.nextInt();
        double totalWP = 0; // ***
        for (items = 1; items <= NumofItems; items++) {
            System.out.println("Enter the wholesale price of item " + items);
            WS = keyboard.nextDouble();
            System.out.println("Enter the markup percentage for item: " + items);
            MP = keyboard.nextDouble();
            System.out.println("The retail price of item " + items + " is $" + (WS + (MP * WS)));
            totalWP = totalWP + WS; // ***
        }
        System.out.println("Total wholesale price for the " + items + " items is " + totalWP);
        double totalRP;
        RP = (WS + (MP * WS)); // ***
        totalRP = RP * NumofItems;
        System.out.println("Total retail price for the " + items + " items is " + totalRP);
    }
}

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你希望得到什么？你得到了什么？你做了什么来调试这个？我希望总共得到65.00美元，我得到45.00美元。我知道对于totalWP，我需要将所有3个完整的销售价格相加，但我无法计算出java可以接受的公式。请尝试在for循环中而不是之后进行相加。在循环之前初始化totalWP。如果用户输入3项，当java只能识别其中一项时，我如何将它们添加到一起？示例：项目1为10，项目2为10，项目3为10显然等于30，但我如何告诉java识别所有这些，并将它们相加，而不是识别1？