Java 转换装置故障
我很难理解如何将金额(如1.17美元)转换为该输出:Java 转换装置故障,java,Java,我很难理解如何将金额(如1.17美元)转换为该输出: 1美元 一角 1镍币 2便士 我需要使用if语句,我可以计算出来,但是,我的问题是试图正确显示变化量。这是我的密码。我是一个视觉学习者,所以如果你让我朝着正确的方向开始,那会很有帮助 import java.util.Scanner; public class ComputeChange { public static void main(String[] args) { Scanner input = new
- 1美元
- 一角
- 1镍币
- 2便士李>
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 ");
}
}
您可能需要使用模数运算符
%
。它与2个数字一起使用,并返回a
除以b
的余数,其中a
是左手赋值,b
是右手赋值,如a%b
例如:
11%2=1
说明:5*2=10
,11-10=1
.66%.25=.16
说明:2*.25=.5
,.66-.5=.16
从一个简单的问题开始,你只有两种类型的硬币,比如说
8¢
或$0.08
double monies = .08;
int numNickles = (int)(monies/.05) = 1 // one nickle
monies = monies % .05; // or you can write as monies %=.05;
// monies value should now be .03
int numPennies = (int)(monies/.01) = 3 // three pennies
一种比使用模数更简单的方法是,自上而下(从最高到最低)计算测量单位,并从已转换为最低单位的总量中不断扣除 许多库也将这种方法与时间单位结合使用,即将时间跨度转换为小时、分钟和秒。对于货币,这里有同样的方法。我添加了内联注释以尽可能最好地解释代码
// 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
作为
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:
谢谢你的视觉帮助,我只是想弄清楚如何把它放到嵌套的if语句形式中。
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