Question

我的计算器代码问题-输出值不正确这是我的代码，任何答复将不胜感激。

import java.util.Scanner;

public class Savings {

    public static void main(String[] args) {

        Scanner console = new Scanner(System.in);

//ask for initial amount
        System.out.print("What is the initial savings amount? ");

        double initialAmount = console.nextDouble();

// ask for number of months
        System.out.print("What is the number of months to save? ");

        int months = console.nextInt();

//ask for interest rate
        System.out.print("What is the annual interest rate? ");

        double interestRate = console.nextDouble();

//calculate total



        double monthlyInterest = ((interestRate/100)*(1/12));

        double number1 = (monthlyInterest + 1);

        double number2 = Math.pow(number1, months);

        double total = (initialAmount*number2);


        System.out.println("$" + initialAmount + ", saved for " + months + " months at " + interestRate + "% will be valued at $" + total);

        console.close();
    }
}

最终值与初始值相同

Answer 1

更改此：

double monthlyInterest = ((interestRate/100)*(1/12));

到

double monthlyInterest = (interestRate / 100) * (1.0 / 12.0);

您正在尝试在浮点上下文中进行整数除法，因此在monthlyInterest中，您实际上是将interestRate / 100与0相乘。

Answer 2

用数字添加d可以将它们转换为双精度并保留十进制值-

double monthlyInterest = ((interestRate/100d)*(1/12d));

如果对整数进行1/12，则输出将为0，而对于1/12d，输出将为0.08333333333333333

此外，您可以去除多余的括号-

double monthlyInterest = (interestRate/100d)*(1/12d);
...
double number1 = monthlyInterest + 1;
...
double total = initialAmount * number2;

利息计算器

2 个答案: