Question

所以我需要制作一个计算折扣的计算器。我不知道我错过了我的代码没有运行，我需要它来读取输入的金额并分配正确的折扣（100或更少5％，超过100低于250 10％，250或更高15％）然后在折扣和税后产生总金额感谢您的任何帮助或建议=）

/*
    Sarah Goldberg Week 5 3 part discount 
*/
import java.util.*;

public class Discount5 {

    public static final double TAXRATE = 0.06; 

    public static void main(String[] args) {
        double amount, tax, subTotal, due;
        final double discount;
        Scanner input = new Scanner(System.in);

        System.out.println("Total due calculation program");

        //input 
        System.out.print("Enter the sales amount: $");
        amount = input.nextDouble();

        //discount
        if (amount <= 100){
            discount = amount * 0.05;
        }
        else if (amount > 250 & amount < 100) {
            discount = amount * 0.10; 
        }
        else (amount >= 250) {
            discount = amount * 0.15;
        }

        subTotal = amount - discount;


        tax = subTotal * TAXRATE;


        due = subTotal + tax;

        // output 
        System.out.println("Bill Summary:");
        System.out.printf("   sales amount: $%2.2f\n", amount);
        System.out.printf("   discount: $%2.2f\n", discount);
        System.out.printf("   tax (at  %2.2f%%): $%2.2f\n",(TAXRATE*100),tax);
        System.out.printf("  Total due: $%2.2f\n" ,due);

        input.close();
    }

}

Answer 1

你的＆amp;＆amp;运算符错误，你不应该在else中写任何条件。

if (amount <= 100){
        discount = amount * 0.05;
    }
    else if (amount < 250 && amount > 100) {
        discount = amount * 0.10; 
    }
    else {
        discount = amount * 0.15;
    }

如果您的折扣在if-else块中发生变化并且未初始化，则您不能将折扣用作final变量，您也需要初始化它。

这将有效 -

/*
    Sarah Goldberg Week 5 3 part discount 
*/
import java.util.*;

public class Discount5 {

public static final double TAXRATE = 0.06; 

public static void main(String[] args) {
    double amount, tax, subTotal, due;
    double discount = 0;
    Scanner input = new Scanner(System.in);

    System.out.println("Total due calculation program");

    //input 
    System.out.print("Enter the sales amount: $");
    amount = input.nextDouble();

    //discount
    if (amount <= 100){
        discount = amount * 0.05;
    }
    else if (amount < 250 && amount > 100) {
        discount = amount * 0.10; 
    }
    else if(amount>=250) {
        discount = amount * 0.15;
    }

    subTotal = amount - discount;


    tax = subTotal * TAXRATE;


    due = subTotal + tax;

    // output 
    System.out.println("Bill Summary:");
    System.out.printf("   sales amount: $%2.2f\n", amount);
    System.out.printf("   discount: $%2.2f\n", discount);
    System.out.printf("   tax (at  %2.2f%%): $%2.2f\n",(TAXRATE*100),tax);
    System.out.printf("  Total due: $%2.2f\n" ,due);

    input.close();
}

}

Answer 2

＆安培;＆安培;运算符错误

else if (amount > 100 && amount < 250 ) {
    discount = amount * 0.10; 
}

并且折扣不应该是最终的

java中的三部分折扣

2 个答案: