硬币数学转换问题 [英] Coin Math Conversion Issue

问题描述

我目前正在编写一个程序，它会将便士转换成正确的二十，十，五，美元，季度，迪斯，镍和便士的数量。我已经得到了程序的第一部分正确，但一旦我得到美元，我的数学不输出正确的金额。任何帮助？

  import java.util.Scanner; 
 
 public class assignment1 {
 
 public static void main（String [] args）{
 Scanner inputReader = new Scanner（System.in）; 
 
 int num，remainder; 
 
 System.out.print（输入一个值作为一个数字：）; 
 num = inputReader.nextInt（）; 
 
 remainder = num％2000; 
 
 System.out.println（num +pennies is equal to：）; 
 System.out.println（（num / 2000）+twenties）; 
 System.out.println（（remainder / 1000）+tens）; 
 System.out.println（（（remaining％1000）/ 500）+fives）; 
 System.out.println（（（（remainder％1000）％500）/ 100）+dollars）; 
 System.out.println（（（（（remaining％1000）％500）％100）/ 25）+quarters）; 
 System.out.println（（（（（remaining％1000）％500）％100）％25）/ 10 +dimes）; 
 System.out.println（（（（（remaining％1000）％500）％100）％25）％10）/ 5 +nickels）; 
 System.out.println（（（（（（remaining％1000）％500）％100）％25）％10）％5）/ 1 +pennies 
 
} 
} 
  

解决方案<

好的。我看到你做了什么。让我们从

开始

  System.out.println（（num / 2000）+twenties）; 
 System.out.println（（remainder / 1000）+tens）; 
 System.out.println（（remainder / 1000）％500 +fives）; 
 System.out.println（（（（remaining / 1000）％500）％100）+dollars）; 
  

第一行是正确的。但是你不能使用简单的余数来保持运行的计数。此外， num 和 remainder 是可怕的变量名。您可以为运行的计数器执行这样的操作，

  System.out.print（输入一个值， ：）; 
 int pennies = inputReader.nextInt（）; 
 System.out.println（pennies +pennies is equal to：）; 
 int twenties = pennies / 2000; 
 pennies  -  = twenties * 2000; 
 int tens = pennies / 1000; 
 pennies  -  = tens * 1000; 
 int fives = pennies / 500; 
 pennies  -  = fives * 500; 
 int dollars = pennies / 100; 
 pennies  -  = dollars * 100; 
 int quarters = pennies / 25; 
 pennies  -  = quarters * 25; 
 int dimes = pennies / 10; 
 pennies  -  = dimes * 10; 
 int nickels = pennies / 5; 
 pennies  -  = nickels * 5; 
 System.out.printf（％d个二十，％d个，％d个fives，％d美元，
 +％d个季度，％d个dimes，％d个镍，％d个n，二十，
 tens，fives，dollars，quarters，dimes，nick，pennies）; 
  

这将输出（用5869作为输入），

  5869 pennies等于：
 2二十，1 10，1 fives，3 dollars，2 quarter，1 dimes，1 nick，4 pennies 
  

或者（如果你想要一个不运行的tally），只需从penny中删除

  System.out.println（pennies +pennies is equal to：）; 
 int twenties = pennies / 2000; 
 int tens = pennies / 1000; 
 int fives = pennies / 500; 
 int dollars = pennies / 100; 
 int quarters = pennies / 25; 
 int dimes = pennies / 10; 
 int nickels = pennies / 5; 
 System.out.printf（％d个二十，％d个，％d个fives，％d美元，
 +％d个季度，％d个dimes，％d个镍，％d个n，二十，
 tens，fives，dollars，quarters，dimes，nick，pennies）; 
  

对于5869，您可以获得

  5869 pennies等于：
 2二十，5十，11五年，58美元，234季，586迪斯，1173镍，5869便士
  

i'm currently coding a program that will convert pennies into the correct number of Twenties, tens, fives, dollars, quarters, dimes, nickels, and pennies. I've gotten the first part of the program correct but once i get to dollars my math is not outputting the correct amount. Any help?

import java.util.Scanner;

public class assignment1 {

public static void main(String[] args) {
    Scanner inputReader = new Scanner(System.in);

    int num, remainder;

    System.out.print("Enter a value as a number of pennies: ");
    num = inputReader.nextInt();

    remainder = num % 2000;

    System.out.println(num + " pennies is equal to:");
    System.out.println((num / 2000) + " twenties");
    System.out.println((remainder / 1000) + " tens");
    System.out.println(((remainder % 1000) / 500) + " fives");
    System.out.println((((remainder % 1000) % 500) / 100) + " dollars");
    System.out.println(((((remainder % 1000) % 500) % 100) / 25) + " quarters");
    System.out.println(((((remainder % 1000) % 500) % 100) % 25) / 10 + " dimes");
    System.out.println((((((remainder % 1000) % 500) % 100) % 25) % 10) / 5 + " nickels");
    System.out.println(((((((remainder % 1000) % 500) % 100) % 25) % 10) % 5) / 1 + " pennies");

}
}

解决方案

Ok. I see what you've done. Let's start with

System.out.println((num / 2000) + "twenties");
System.out.println((remainder / 1000) + "tens");
System.out.println((remainder / 1000) % 500 + "fives");
System.out.println((((remainder / 1000) % 500) % 100) + "dollars");

The first line is correct. But you cannot use a simple remainder to keep a running tally. Also, num and remainder are terrible variable names. You can do something like this for a running tally,

System.out.print("Enter a value as a number of pennies: ");
int pennies = inputReader.nextInt();
System.out.println(pennies + " pennies is equal to:");
int twenties = pennies / 2000;
pennies -= twenties * 2000;
int tens = pennies / 1000;
pennies -= tens * 1000;
int fives = pennies / 500;
pennies -= fives * 500;
int dollars = pennies / 100;
pennies -= dollars * 100;
int quarters = pennies / 25;
pennies -= quarters * 25;
int dimes = pennies / 10;
pennies -= dimes * 10;
int nickels = pennies / 5;
pennies -= nickels * 5;
System.out.printf("%d twenties, %d tens, %d fives, %d dollars, "
        + "%d quarters, %d dimes, %d nickels, %d pennies%n", twenties,
        tens, fives, dollars, quarters, dimes, nickels, pennies);

That would output (with 5869 as input),

5869 pennies is equal to:
2 twenties, 1 tens, 1 fives, 3 dollars, 2 quarters, 1 dimes, 1 nickels, 4 pennies

Or (if you wanted a non-running tally), just remove the subtractions from pennies like

System.out.println(pennies + " pennies is equal to:");
int twenties = pennies / 2000;
int tens = pennies / 1000;
int fives = pennies / 500;
int dollars = pennies / 100;
int quarters = pennies / 25;
int dimes = pennies / 10;
int nickels = pennies / 5;
System.out.printf("%d twenties, %d tens, %d fives, %d dollars, "
        + "%d quarters, %d dimes, %d nickels, %d pennies%n", twenties,
        tens, fives, dollars, quarters, dimes, nickels, pennies);

And for 5869 you get

5869 pennies is equal to:
2 twenties, 5 tens, 11 fives, 58 dollars, 234 quarters, 586 dimes, 1173 nickels, 5869 pennies

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