JAVA变量超出范围

Question

我是一名学生，刚刚学习类和方法。我收到错误(第 30 行 - saving = pr *discount/100)“找不到符号”。我知道我的变量折扣超出了范围，但我不知道如何纠正这个问题。我已按照提供给我的说明进行操作，但它仍然不起作用。我已经在课本上发现了一些错别字，难道还漏掉了什么吗？或者是我大括号的位置？

import java.util.Scanner; // Allows for user input

public class ParadiseInfo2
    {
    public static void main(String[] args)
    {
        double price; // Variable for minimum price for discount
        double discount; // Variable for discount rate
        double savings; // Scanner object to use for keyboard input
        Scanner keyboard = new Scanner(System.in);

        System.out.print("Enter cutoff price for discount >> "); 
        price = keyboard.nextDouble();
        System.out.print("Enter discount rate as a whole number >> ");
        discount = keyboard.nextDouble();

        displayInfo();

        savings = computeDiscountInfo(price, discount); 


    System.out.println("Special this week on any service over " + price);
    System.out.println("Discount of " + discount + " percent");
    System.out.println("That's a savings of at least $" + savings);

    }

    public static double computeDiscountInfo(double pr, double dscnt)
    {
    double savings;
    savings = pr * discount / 100;
    return savings;
    }

    public static void displayInfo()
    {   
    System.out.println("Paradise Day Spa wants to pamper you.");
    System.out.println("We will make you look good.");  
    }   
}   

Answer 1

您的代码是正确的 - 当您需要范围内变量 dscnt 时，您只是调用了范围外变量折扣。试试这个:

public static double computeDiscountInfo(double pr, double dscnt) {
    double savings;
    savings = pr * dscnt / 100;
    return savings;
}