1
在执行这段代码时,我期望0.00,但是我得到-0.00。 此代码基于市场利率计算债券价格,如果以溢价或折扣提供,则确定 然后计算。负数而不是正数
我所关心的部分是确定保费 帐户的余额。在计算这个时,我在变量premium_bal2上使用 - =。
下面的代码:
package totalbeginner.demo;
import java.text.NumberFormat;
import java.util.Locale;
import javax.swing.*;
public class TotalBeginner{
public static void main(String[] args){
System.out.println("We are offering a $100,000 bond at 10% par for 3 years");
double price; //price of bond determined from rates
double market_rate = Double.parseDouble(JOptionPane.showInputDialog("What is the market rate?"));
NumberFormat formatter= NumberFormat.getCurrencyInstance(Locale.UK);
int year=1;//year
double premium_bal=0;;//premium balance
double premium_bal2=0;
if(market_rate<10){//premium bond offer
price = (0.10*100000*5.5673)+(100000*0.5565);
premium_bal= price-100000;//premium bal
premium_bal2 = price-100000;//premium bal
System.out.println("Cash dr. "+formatter.format(price));
System.out.println("Premium dr. "+formatter.format(price-100000));
System.out.println("Bonds Payable cr. "+ formatter.format(100000));// issue journal entry
while(year<3){
System.out.println("Interest dr. "+formatter.format(10000));//interest payment
System.out.println("Cash cr. "+formatter.format(10000));
//write-off
System.out.println("Interest dr. "+formatter.format(premium_bal/3));
System.out.println("Premium cr. "+formatter.format(premium_bal/3));
premium_bal2-=premium_bal/3;
if (year==2){
System.out.println("Interest dr. "+formatter.format(10000));//interest payment
System.out.println("Cash cr. "+formatter.format(10000));
System.out.println("Cash cr. "+formatter.format(100000));//Bond retirement
System.out.println("Bonds Payable dr. "+formatter.format(100000));
//write-off
System.out.println("Interest dr. "+formatter.format(premium_bal/3));
System.out.println("Premium dr. "+formatter.format(premium_bal/3));
//Amount in balance account
premium_bal2-=premium_bal/3;
System.out.println("Amount in premium account: "+formatter.format(premium_bal2));
}
//counter year
year++;
}
}
System.exit(0);
}
}
您不应该使用浮点类型来表示金钱。 – Bubletan
可以肯定,'premium_bal2'总是大于'premium_bal/3'吗? fyi,double'0.00'和'-0.00'实际上*数学*讲话在二进制表示中是相同的但不同的,这是计算机的局限性(一般而言)。无论如何,有些人试图用一些[技巧](http://stackoverflow.com/a/11929320/4648586)消除负号,而不是干涉数字本身。 - [你需要了解的浮点数](https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html) –