java - 编程存储数量并编写 else if 语句以显示正确的

Question

最后的程序将显示最终的估算报告。如果用户只要求一张表，则输出将显示最终总估计值，该表为单数。如果用户要求多个表，输出将显示表的数量和总成本。如果用户根本没有请求任何估计，程序应该显示一条消息说明这一点。

它只显示“您没有估计任何表格......”

public class Table {

    public static void main(String[] args) {

        String material;

        int tChoice;
        int mChoice;
        int numTable = 0;
        double tableCost;
        double total = 0;
        double pLaminate = 0.125;
        double pOak = 0.25;


        Scanner input = new Scanner(System.in);

        System.out.println("Welcome to Tables are Us - Your One Stop Table Shop");
        System.out.println("Mike - Master Table Builder");

        boolean bFlag = true;

        while (bFlag) {
            double area = 0;
            double length = -1;
            double width = -1;
            double diameter = -1;
            double radius = -1;

            do {
                System.out.println("\n\nWhat shape of table do you wish to build?");
                System.out.println("\t1. Rectangular");
                System.out.println("\t2. Sqaure");
                System.out.println("\t3. Circular");
                System.out.println("\t4. End Program");
                System.out.print("Enter menu entry: ");

                tChoice = input.nextInt();

                if (tChoice < 1 || tChoice > 4) {
                    System.out.println("Error - Invalid Entry. Please reenter a valid value.");
                }

            } while (tChoice < 1 || tChoice > 4);

            if (tChoice == 1) {
                while (length < 0) {
                    System.out.print("Enter the length of the table (in inches): ");
                    length = input.nextDouble();

                    if (length < 0) {
                        System.out.println("Error - the length must be greater than zero. Please reenter!!");
                    }
                }

                while (width < 0) {
                    System.out.print("Enter the width of the table (in inches): ");
                    width = input.nextDouble();

                    if (width < 0) {
                        System.out.println("Error - the width must be greater than zero. Please reenter!!");
                    }
                }

                area = length * width;
            } else if (tChoice == 2) {
                while (length < 0) {

                    System.out.print("Enter the length of the table (in inches): ");

                    length = input.nextDouble();

                    if (length < 0) {
                        System.out.println("Error - the length must be greater than zero. Please reenter!!");
                    }
                }

                area = length * length;
            } else if (tChoice == 3) {
                while (diameter < 0) {
                    System.out.print("Enter the diameter of the table (in inches): ");
                    diameter = input.nextDouble();

                    if (diameter < 0) {
                        System.out.println("Error - the diameter must be greater than zero. Please reenter!!");
                    }
                }

                radius = diameter / 2;
                area = Math.PI * radius * radius;

            } else if (tChoice == 4) {
                if (numTable == 0) {
                    System.out.println("\nYou did not estimate any tables today!");
                } else {
                    System.out.printf("The total cost of the " + numTable + "tables you estimated is $" + String.format("%.2f", total));
                }


                System.out.println("Thank you for using the table cost estimation program!");
                System.out.println("GoodBye!!!");

                input.close();

                return;
            }

            do {
                System.out.println("\nWhat type of material do you want to use?");
                System.out.println("\t1. Laminate ($0.125 per square inch)");
                System.out.println("\t2. Oak ($0.25 per square inch)");
                System.out.print("Enter menu entry: ");

                mChoice = input.nextInt();

                if (mChoice < 1 || mChoice > 2) {

                    System.out.println("Error - Invalid Entry. Please reenter a valid value.");
                }

            } while (mChoice < 1 || mChoice > 2);


            if (mChoice == 1) {
                material = "Laminate";

                tableCost = area * pLaminate;
            } else {
                material = "Oak";

                tableCost = area * pOak;
            }

            System.out.println("\nOutput Report:");
            System.out.printf("The area of table is " + String.format("%.2f", area) + " square inches");
            System.out.printf("\nThe table will be made of " + material);
            System.out.printf("\nThe cost of the table is $" + String.format("%.2f", tableCost));

            total = total + tableCost;

            total++;

        }
        input.close();
    }
}

标签： java

Answer 1

        System.out.printf("The total cost of the %d tables you estimated is $%.2f%n", numTable, total);

打印格式的末尾需要换行符%n。确保numTable已设置。