转换单元的问题

时间:2015-02-21 07:30:20

标签: java

我很难理解如何将$ 1.17等金额转换为此输出:

  • 1美元,
  • 1角钱,
  • 1镍,
  • 2便士。

我需要使用我可以弄清楚的if语句但是,我遇到的问题是试图让更改数量正确显示。这是我的代码。我是一个视觉学习者,所以如果你从正确的方向开始我将会有所帮助。

import java.util.Scanner;

public class ComputeChange {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter an amount in double, for example 11.56: " );
        double number = input.nextDouble();
        System.out.println("Your amount " + number + " consists of ");
        int Dollars = (int) (number);
        int Quarters = Dollars / 25;

        if (number == 1) {
                    System.out.print("1 dollar ");
        }
            else if (number > 1) {
                System.out.print((int)Dollars + " dollars ");
            }
            if (number == 0) {
                System.out.println("");
            }
            System.out.print( Quarters + " Quarters ");
    }
}

2 个答案:

答案 0 :(得分:2)

您可能希望使用模数运算符%。它与2个数字一起使用,并返回余下的a除以b,其中a是左手赋值,b右手代表{{1} }。

示例:

a%b解释:11%2=15*2 = 10

11-10 = 1解释:.66%.25=.162*.25 = .5


从一个简单的问题开始,你只有两种类型的硬币,比如.66-.5=.16

$0.08

答案 1 :(得分:1)

比使用模数更简单的方法是以自上而下的方式(从最高到最低)计算测量单位,并从已经转换为最低单位的总数中扣除它们

许多图书馆也以 time 的单位使用这种方法,即将时间跨度转换为小时,分钟和秒。这是货币的相同方法。我添加了内联注释以尽可能地解释代码。

// Scan the amount
Scanner scanner = new Scanner(System.in);
System.out.print("Enter amount: ");
double amount = scanner.nextDouble();
scanner.close();

// convert into cents 
int cents = (int) (amount * 100);

// get dollars
int dollars = cents/100;
// cents left after dollars
cents = cents - dollars*100;

// get quarters
int quaters = cents/25;
// cents left after quarters
cents = cents - quaters*25;

// get dimes
int dimes = cents/10;
// cents left after dimes
cents = cents - dimes*10;

// get nickels
int nickels = cents/5;
// cents left after nickels
cents = cents - nickels*5;

// leftover cents are pennies
int pennies = cents;

现在,只需使用StringBuilder

构建输出消息
StringBuilder msg = new StringBuilder("You have:");
if (dollars > 0) {
    msg.append(" ").append(dollars).append(" dollar").append(dollars > 1 ? "s" : "");
}
if (quaters > 0) {
    msg.append(" ").append(quaters).append(" quarter").append(quaters > 1 ? "s" : "");
}
if (dimes > 0) {
    msg.append(" ").append(dimes).append(" dime").append(dimes > 1 ? "s" : "");
}
if (nickels > 0) {
    msg.append(" ").append(nickels).append(" nickel").append(nickels > 1 ? "s" : "");
}
if (pennies > 0) {
    msg.append(" ").append(pennies).append(" pennie").append(pennies > 1 ? "s" : "");
}

System.out.println(msg);

输出:

Enter amount: 1.17
You have: 1 dollar 1 dime 1 nickel 2 pennies

Enter amount: 12.99
You have: 12 dollars 3 quarters 2 dimes 4 pennies