Question

第二行代码是我声明数据类型的地方。在我的第二个if语句中，我尝试使用所有准备就绪的其他变量初始化变量。

    int items;
    double itemPrice, discountR, totalCost,discountCost, x; 
    Scanner scan = new Scanner(System.in);
    System.out.println("Enter the quantity of the item: -->");
    items = scan.nextInt();
    System.out.print("Enter the price of an item: -->");
    itemPrice = scan.nextDouble();

我做一个扫描仪并声明我的输入。

    if(items <= 0 || itemPrice <= 0)
    System.out.print("Error: Input must be greater than zero");

    else if(items <= 9)
    { 
    totalCost = itemPrice;   
    discountR = 0;
    System.out.print("Your total cost is "+ totalCost);
    System.out.print("Your discount rate is "+ discountR);
    System.out.print("Discount amount is $O");
    System.out.print("The net amount is "+ itemPrice);
    }

首先测试一切正常

    else if(items >= 10 && items <= 19)
    {
    discountR = 0.1;
    itemPrice * discountR = x; **Where the problem occurs**
    System.out.print("Your total cost is "+ totalCost);
    System.out.print("Your discount rate is "+ discountR);
    System.out.print("Discount amount is $O");
    System.out.print("The net amount is "+ itemPrice);
    }

Answer 1

itemPrice * discountR = x; **Where the problem occurs**

将其更改为：

x = itemPrice * discountR;

为什么我不断获取未初始化的变量x？

1 个答案: