Question

好吧所以我已经制定了复合利率计划。但现在对于这个程序，我必须使用更多方法重新编写程序。使用

private static double FVCALC(..)

和

private static double validate(........)

我不太明白我需要怎么做。我目前的代码只允许我输入3个利率值并停止。是因为private mehtods？我不知道该怎么做，我已经搜索了3天了。

底线是。我的代码没有按照我想要的方式工作。

public class interest_rate 
{

    static Scanner input = new Scanner(System.in);
    public static void main(String[] args)
    {
            double i;
            double n;
            double FVCalc;
            double PV;
            System.out.print("please enter value for n (years): ");
            n = input.nextInt();
            System.out.print("please enter interest rate: ");
            i=input.nextDouble();
            System.out.print("please enter Present Value: ");
            PV = input.nextDouble();        


    }
    private static double validate (double upLimit, double lowLimit, double PV)
    {

        upLimit=100000.00;
        lowLimit=0.00;
        while(PV>upLimit|| PV<lowLimit)
        {
            System.out.print("please enter value between "+upLimit+" and "+lowLimit);
            System.out.print("please enter PV");
            PV=input.nextDouble();
        }



        return PV;


    }




    private static double FVCalc(double PV, double i, double n, double FV)
    {


        FV = PV*Math.pow(1+(i/100), n);

        return(FV);
    }

}

Answer 1

首先，您需要调用 main中的方法。

其次，你无法传递PV，然后重新分配它并期望值更新。

例如......

private static double validate (double upLimit, double lowLimit, double PV)

你需要在主体中调用它，如此

PV = 0.0; // some double value 
double validated = validate(0,100000); // return the value, don't pass it in

并删除该方法中的这些行，因为覆盖参数通常很糟糕。

upLimit=100000.00;
lowLimit=0.00;

接下来，为要在整个班级中使用的值添加字段。

public class InterestRate 
{

    static double pv , fvCalc;
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args) {

    }

然后在main中删除这些行并改为使用这两个类变量

double FVCalc;
double PV;

此外，我没有看到将fvCalc存储为变量的理由。你可以计算它

private static double fvCalc(double pV, double i, double n)
{
    return pV*Math.pow(1+(i/100), n);   
}

Answer 2

我相信我已经弄明白了。我做得很漂亮请原谅。我想让他们留在那里，看看我做错了什么。谢谢大家。

public class interest_rate 
{
    static double pV , fvCalc, i, n;
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args)
    {
        double validated;
        double calculated;
        double i;
        double n;
        //double fV; 
        //double pV1;
        System.out.print("please enter value for n (years): ");
        n = input.nextInt();
        System.out.print("please enter interest rate: ");
        i=input.nextDouble();
        validated = validate(0,100000); 
        System.out.println("pV is validated and equal to: "+validated);
        calculated= fvCalc(validated,i,n);
        System.out.println("your calulation for interest is: "+calculated);
    }
    private static double validate(double upLimit, double lowLimit) {
    double pV;
    System.out.print("please enter pV");
    pV=input.nextDouble();
    while(pV<upLimit|| pV>lowLimit)
    {
        System.out.print("please enter value between "+upLimit+" and "+lowLimit);
        System.out.println("please enter pV");
        pV=input.nextDouble();
    }
    return pV;
    }
    private static double fvCalc(double pV, double i, double n)
    {
        double fV;
        fV=pV*Math.pow(1+(i/100), n);   
        return fV;
    }

}

利率java与私人静态双打混淆

2 个答案: