Question

package methods;
import java.util.Scanner;

/**
*
* @author Billy
*/
public class Methods {

/**
 * @param args the command line arguments
 */
    public static void main(String[] args) {      
    double Loanamount; // Loan amount from user
    double Aintrate; // User's annual interest rate
    double months; // Number of months on loan
    double monp; // Monthly payment
    double Mintrate; // Monthly interest rate
    double n; // The number of payments


    // declare an instance of Scanner to read the datastream from the keyboard.
    Scanner kb = new Scanner(System.in);

    // Get user's loan amount
    System.out.print("Please enter your total loan amount: ");
    Loanamount = kb.nextDouble();

    // Get user's interest rate
    System.out.print("Please enter your annual interest rate as a decimal: ");
    Aintrate = kb.nextDouble();

    // Get user's number of months
    System.out.print("Please enter the number of months left on your loan: ");
    months = kb.nextDouble();

    // Calculate montly interest rate
    Mintrate = ((Aintrate / 12));

       System.out.println("Your monthly interest rate is " + " " + Mintrate);

    // Calculate number of payments
       n = ((months * 12));

    // Calculate monthly payment

我的下一个工作是使用此公式查找每月付款。

M = P [i（1 + i）^ n] / [（1 + i）^ n - 1]

其中

M =每月按揭付款
  P =借入的金额（贷款额）
  i =每月利率（Mintrate）
  n =付款次数

我尝试了以下但我无法弄明白 monp = Loanamount [Mintrate(1+ Mintrate)^n] / [(1+ Mintrate)^n-1 ];

Answer 1

Math.pow是您需要的，而不是^。您也无法使用[或]。您必须使用括号(和)。更多数学函数可在以下位置找到： http://docs.oracle.com/javase/7/docs/api/java/lang/Math.html

Answer 2

您需要在此处使用Math.pow effectivley。

尝试在代码中使用以下内容

monp = Loanamount*(Mintrate*Math.pow((1+ Mintrate),n)) / (Math.pow((1+ Mintrate),n-1 ) ;

Answer 3

^的方法在Java中称为Math.pow(double a, double b);。

a是要筹集b次的数字。

您的公式看起来像monp = Loanamount Math.pow((Mintrate(1+ Mintrate), n)) / (Math.pow((1+ Mintrate), n-1));

Reference

Answer 4

你需要调用Math.pow（double，double）

或者您可以将所需的类导入为..
import static java.lang.Math.pow;
然后使用pow（）函数

Noob需要一些帮助来实现一个公式

4 个答案: