爲什麼我的輸出沒有顯示什麼，我想正確

Question

import java.util.Scanner; 
public class CalculatePurchasePrice 
{ 

    public static void main(String [] args) 
    { 


    Book Cost: $10.00 
    State Tax Charged: $0.80 
    County Tax Charged: $0.30 
    Total Purchase Price: $11.10 


    Scanner kbd = new Scanner (System.in); 

    System.out.println("Price of the book: "); 

    bookPrice = kbd.nextDouble(); // get user input 

    double staxCharged = bookPrice * stateTax; 

    System.out.println("State Tax Charged: " + staxCharged); 

    double ctaxCharged = bookPrice * countyTax; 

    System.out.println("County Tax Charged: " + ctaxCharged); 

    totalPP = bookPrice + staxCharged + ctaxCharged; 

    System.out.println("Total Purchase Price: " + totalPP); 

    } 
} 


*/ 
Total is suppose to display $11.10 
Total displays $11.1000000000001 
/* 

Answer 1

這應做到：System.out.printf（ 「總買價：％.2f％N」，totalPP）;

你應該閱讀https://docs.oracle.com/javase/tutorial/java/data/numberformat.html