java - Java中如何获取金币数量？

Question

我有我的代码，用户输入金额，输出显示二十、十、五、一、二十五、二毛五、一毛、镍和便士的数量，但是我希望用户输入硬币数量(例如 36 个)并获取相当于 36 美分的仅硬币数量。这意味着我应该得到 1 夸特、1 毛钱和 1 便士。请有人帮助我解决这个问题。非常感谢!

注意:
DecimalFormat 类不是必需的

这是我的代码:

import java.util.Scanner;
import java.text.DecimalFormat;
public class Compu
{ 
public static void main(String[] args)
{
   Scanner input = new Scanner(System.in);
   DecimalFormat decimalFormat = new DecimalFormat("0.00");

    System.out.println("Please Enter an amount of Money:");       
    double change = input.nextDouble();


    int dollars = (int)change;
    int twenties = dollars / 20;
    int dollars1 = dollars % 20;
    int tens = dollars1 / 10;
    int dollars2 = dollars % 10;
    int fives = dollars2 / 5;
    int dollars3 = dollars % 5;
    int ones = dollars3;

    String moneyString = decimalFormat.format(change);
    String changeString = Double.toString(change); 
    String[] parts = moneyString.split("\\.");
    String part2 = parts[1]; 
    double cents5 = Double.parseDouble(part2);

    int cents = (int)cents5;
    int quarters = cents / 25;
    int cents1 = cents % 25;
    int dimes = cents1 / 10;
    int cents2 = cents % 10;
    int nickels = cents2 / 5;
    int cents3 = cents % 5;
    int pennies = cents3;

    System.out.println("Input entered by user: " + "$" + moneyString);


    System.out.println(twenties + " Twenties");
    System.out.println(tens + " Tens");
    System.out.println(fives + " Fives");
    System.out.println(ones + " Ones");
    System.out.println(quarters + " Quarters");
    System.out.println(dimes + " Dimes");
    System.out.println(nickels + " Nickels");
    System.out.println(pennies + " Pennies");

  }
}

Answer 1

模运算符是你的 friend :

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.println("Please enter amount in cents");
    double cents = input.nextInt();

    int numQuarters = cents / 25;
    int numDimes    = (cents % 25) / 10;
    int numNickels  = ((cents % 25) % 10) / 5;
    int numPennies  = ((cents % 25) % 10) % 5;

    System.out.println(quarters + " Quarters");
    System.out.println(dimes    + " Dimes");
    System.out.println(nickels  + " Nickels");
    System.out.println(pennies  + " Pennies");
}