这段代码在我提到setScale()的那一行上给了我一个错误;我说“需要舍入”给我一个错误。我正在尝试制作一个将使用cp和sp的应用程序,然后根据利润/亏损找到利润/亏损百分比。有人可以用BigDecimal语句帮助我吗?
```java
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Scanner;
abstract class functions
{
abstract void cpSP();
}
public class Percentage
{
static Scanner sc = new Scanner(System.in);
public void cpSP()
{
System.out.println("Enter the Cost Price:");
double CP = sc.nextDouble();
System.out.println("Enter the Selling Price:");
double SP = sc.nextDouble();
if (CP > SP)
{
System.out.println("As the Cost Price is greater than the Selling Price, there will be LOSS.");
System.out.println("Loss = CP - SP");
double loss = CP - SP;
System.out.println("Loss = " + loss);
System.out.println("Now,");
System.out.println("Loss percentage = Loss/CP x 100");
System.out.println("");
double lossPercentage = (loss/CP)*100;
String lPString = Double.toString(lossPercentage);
BigDecimal bd = new BigDecimal(lPString);
bd.setScale(2);
System.out.println("Loss percentage = " + bd + "%" );
}
else if (SP > CP)
{
System.out.println("As the Cost Price is less than the Selling Price, there will be PROFIT.");
System.out.println("Profit = SP - CP");
double profit = SP - CP;
System.out.println("Profit = " + profit);
System.out.println("Now,");
System.out.println("Profit percentage = Profit/CP x 100");
double profitPercentage = (profit / CP)*100;
String pPString = Double.toString(profitPercentage);
BigDecimal bd = new BigDecimal(pPString).setScale(2, RoundingMode.UNNECESSARY);
System.out.println("Proft percentage = " + bd + "%" );
}
else
{
System.out.println("No profit, no loss.");
}
}
侃侃尔雅
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