Question

尝试编写Java程序来满足此要求：Duke Shirts出售Java T恤每件$ 24.95，但是按如下数量可享受折扣：1或2件衬衫，无折扣，总运费为$ 10.00 3-5衬衫，折扣是10％，总运费是8.00美元，6-10件衬衫，折扣是20％，总运费是5.00美元，11件以上的衬衫，折扣是30％，运费是免费的。编写一个Java程序，提示用户输入所需的衬衫数量。然后，程序应打印衬衫的扩展价格，运费和订单总成本。在适当的地方使用货币格式。

这是我的代码：

import java.lang.Math;
import java.util.Scanner;

public class Excercise2_3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("How many shirts do you need?");
        double shirts = input.nextInt();
        if (shirts <= 2)
            System.out.printf("The extended cost is : $%.2", (shirts * 24.95));
            System.out.printf("The shipping charges are $10.00");
            System.out.printf("The total cost is : $%.2", (shirts * 24.95) + 10);
        if (shirts > 2 && shirts <= 5)
            System.out.printf("The extended cost is : $%.2", ((shirts * 24.95)*.10));
            System.out.printf("The shipping charges are $8.00");
            System.out.printf("The total cost is : $%.2", ((shirts * 24.95)*.10) + 8);
        if (shirts > 5 && shirts <= 10)
            System.out.printf("The extended cost is : $%.2", ((shirts * 24.95)*.20));
            System.out.printf("The shipping charges are $5.00");
            System.out.printf("The total cost is : $%.2", ((shirts * 24.95)*.20) + 5);
        if (shirts > 10)
            System.out.printf("The extended cost is : $%.2", ((shirts * 24.95)*.00));
            System.out.printf("Shipping is free!");
            System.out.printf("The total cost is : $%.2", ((shirts * 24.95)*.30));

    }

}

有人可以阐明为什么它不能正确编译吗？谢谢！

Answer 1

您在if语句周围缺少花括号。另外，您的printf格式字符串应为%.2f。您错过了f，也错过了换行符。

import java.util.Scanner;

public class TempApp {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("How many shirts do you need?");
        double shirts = input.nextInt();
        if (shirts <= 2) {
            System.out.printf("The extended cost is : $%.2f\n", (shirts * 24.95));
            System.out.printf("The shipping charges are $10.00\n");
            System.out.printf("The total cost is : $%.2f\n", (shirts * 24.95) + 10);
        }
        if (shirts > 2 && shirts <= 5) {
            System.out.printf("The extended cost is : $%.2f\n", ((shirts * 24.95) * .10));
            System.out.printf("The shipping charges are $8.00\n");
            System.out.printf("The total cost is : $%.2f\n", ((shirts * 24.95) * .10) + 8);
        }
        if (shirts > 5 && shirts <= 10) {
            System.out.printf("The extended cost is : $%.2f\n", ((shirts * 24.95) * .20));
            System.out.printf("The shipping charges are $5.00\n");
            System.out.printf("The total cost is : $%.2f\n", ((shirts * 24.95) * .20) + 5);
        }
        if (shirts > 10) {
            System.out.printf("The extended cost is : $%.2f", ((shirts * 24.95) * .00));
            System.out.printf("Shipping is free!");
            System.out.printf("The total cost is : $%.2f", ((shirts * 24.95) * .30));
        }
    }
}

使用简单的Java程序遇到麻烦

1 个答案: