钱数整兑零程序,谢谢关注.

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题目要求:
1,编写一个整钱兑零程序，该程序能够将用double类型表达的钱数兑换成相应的硬币，要求精确到分。（硬币的面值有1元、5角、1角、5分、2分、1分，如果输入：12.53，结果应该为：（1元）12，（5角）1，(1角)0,（2分）1，（1分）1 .

import javax.swing.*; 
public class MoneyChange 
{
	public static void main(String[] args) 
	{
		int a,b,c;
		String amountString=JOptionPane.showInputDialog(null,"请输入钱数","整钱兑零",JOptionPane.QUESTION_MESSAGE);
		double amount=Double.parseDouble(amountString);
		a=(int)amount;
		System.out.println("(1元)"+a);
		b=(int)(((amount-a)*10)/1);
		c=(int)((amount-a-b*0.1)*100);
		if(b<5)
			System.out.println("(1角)"+b);
		else if(b==5) 
			System.out.println("(5角)1");
		else
		{
			System.out.println("(5角)1");
			System.out.println("(1角)"+(b-5));
		}
		if(c<2&&c>0)
			System.out.println("(1分)1");
		else if(c==2)
		{
			System.out.println("(2分)1");
		}
		else
		{
			System.out.println("(2分)"+(c/2));
			System.out.println("(1分)"+(c%2));
		}
		
	}
}

问题是:当我输入18.88时,
结果是:
(1元)18
(5角)1
(1角)3
(2分)3
(1分)1
不符合要求,改了半天,仍不见效,本人是初学者,请各位前辈帮助.谢谢.

[ai7090]

这个是float,double的问题，
参考一下别人写的这个
http://blog.csdn.net/tomison/archive/2007/06/30/1672961.aspx

你的程序好像没有对5分钱的情况进行处理！~~

[kanebluba]

 String s="180.75";
double money=Double.parseDouble(s);
        int yuan=(int)money/1;
       System.out.print(yuan+" 个元  ");
        money=(money-yuan)*10;
       int fiveJiao=(int)money/5;
       System.out.print(fiveJiao+"  个5角  ");
       
      
        money=money-(fiveJiao*5);
        int oneJiao=(int)money/1;
        System.out.print(oneJiao+"  个1角   ");
        
        money=money-(oneJiao*1);
        money=money*10;
        int fiveFeng=(int)money/5;
        money=money-5*fiveFeng;
          System.out.println(fiveFeng+"  个5分  ");
          int oneFeng=(int)money/1;
          System.out.println(oneFeng+"  个1分  ");
          

[kanebluba]

忘记看你的2分了,竟然有2分....

    String s="180.27";
        double money=Double.parseDouble(s);
        int yuan=(int)money/1;
       System.out.print(yuan+" 个元  ");
        money=(money-yuan)*10;
       int fiveJiao=(int)money/5;
       System.out.print(fiveJiao+"  个5角  ");
       
      
        money=money-(fiveJiao*5);
        int oneJiao=(int)money/1;
        System.out.print(oneJiao+"  个1角   ");
        
        money=money-(oneJiao*1);
        money=money*10;
        int fiveFeng=(int)money/5;
        money=money-5*fiveFeng;
          System.out.println(fiveFeng+"  个5分  ");
      int twoFeng=(int)money/2;
          money=money-2*twoFeng;
            System.out.print(twoFeng+"  个2分  ");
                int oneFeng=(int)money/2;
          System.out.println(oneFeng+"  个1分  ");

[ai7090]

楼上的可以么？
如果 s=18.88
同样的问题

[starlizhi]

import javax.swing.*;
public class MoneyChange {
public static void main(String[] args) {
double a,b,c,d,e;
String amountString=JOptionPane.showInputDialog(null,"请输入钱数","整钱兑零",JOptionPane.QUESTION_MESSAGE);
double amount=Double.parseDouble(amountString);
a=(int)amount;
b=(int)((amount-a)*2);
c=(int)((amount-a-b/2)*10);
d=(int)((amount-a-b/2-c/10)*50);
e=Math.rint(((amount-a-b/2-c/10-d/50)*100));
System.out.println("(1元)"+a);
System.out.println("(5角)"+b+" "+((amount-a)*2));
System.out.println("(1角)"+c+" "+(amount-a-b/2));
System.out.println("(2分)"+d);
System.out.println("(1分)"+e);
}
}

[starlizhi]

import javax.swing.*; 
public class MoneyChange {
    public static void main(String[] args) {
        double a,b,c,d,e;
        String amountString=JOptionPane.showInputDialog(null,"请输入钱数","整钱兑零",JOptionPane.QUESTION_MESSAGE);
        double amount=Double.parseDouble(amountString);
        a=(int)amount;
        b=(int)((amount-a)*2);
        c=(int)((amount-a-b/2)*10);
        d=(int)((amount-a-b/2-c/10)*50);
        e=Math.rint(((amount-a-b/2-c/10-d/50)*100));
        System.out.println("(1元)"+a);
        System.out.println("(5角)"+b+"  "+((amount-a)*2));
        System.out.println("(1角)"+c+"  "+(amount-a-b/2));
        System.out.println("(2分)"+d);
        System.out.println("(1分)"+e);
    }
}

[kanebluba]

前面竟然损失精度了,用下面的吧

  String s="123.65";
        double money=Double.parseDouble(s);
         money=money*100;
         int yuan=(int)money/100;
         System.out.print(yuan+"个元  ");
         money=money-yuan*100;
         int fiveJiao=(int)money/50;
            System.out.print(fiveJiao+"个5角  ");
            money=money-fiveJiao*50;
             int oneJiao=(int)money/10;
                 money=money-oneJiao*10;
              System.out.print(oneJiao+"个1角  ");
                 int fiveFen=(int)money/5;
                 money=money-fiveFen*5;
                   System.out.print(fiveFen+"个5分  ");
                   int twoFen=(int)money/2;
                 money=money-twoFen*2;
                   System.out.print(twoFen+"个2分  ");
               int oneFen=(int)money/1;
              
                   System.out.print(oneFen+"个1分  ");