java - 无法显示变量

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我对编程很陌生，在我的主要方法中显示可变的monthlyPayment时遇到了一些麻烦；我认为这与先前的方法有关。这是每月付款计算器。

import java.util.Scanner;
public class assignment8 {

public static double pow(double a, int b) {
    double ans = 1;
    if (b < 0) {
        for (int i = 0; i < -b; i++) {
            ans *= 1/a;
        }
    }
    return ans;
}

public static double monthlyPayment(double amountBorrowed, int loanLength, int percentage) {
    double monthlyPayment;
    double P = amountBorrowed;
    double N = 12 * loanLength;
    double r = (percentage / 100) / 12;
    monthlyPayment = (r * P) / (1 - Math.pow((1 + r) , -N ));
    return monthlyPayment;
}

public static void main(String[] args) {
    Scanner kbd = new Scanner(System.in);

    System.out.print("Enter the amount borrowed: $");
    double amountBorrowed = kbd.nextDouble();

    System.out.print("Enter the interest rate: ");
    int interestRate = kbd.nextInt();

    System.out.print("Enter the minimum length of the loan: ");
    int minLoanLength = kbd.nextInt();

    System.out.print("Enter the maximum length of the loan: ");
    int maxLoanLength = kbd.nextInt();

    while (maxLoanLength < minLoanLength) {
        System.out.print("Enter the maximum legth og the loan: ");
        maxLoanLength = kbd.nextInt();
    }
    for (int i = minLoanLength; i <= maxLoanLength; i++) {

        System.out.println(i + monthlyPayment);
    }
}
}

最佳答案

这是您的monthlyPayment方法：

public static double monthlyPayment(double amountBorrowed, int loanLength, int percentage)

它需要3个参数并返回一个double。

这是您调用monthlyPayment方法的方式：

System.out.println(i + monthlyPayment);

您没有向其发送任何参数。您甚至都不包含()。您的编译器应该在抱怨。

您需要这样做：

System.out.println(i + monthlyPayment(amountBorrowed, loanLength, percentage));

注意：您仍然可能无法获得预期的结果。这将汇总i和您对monthlyPayment的调用结果，然后打印出来。您可能想要这样的东西：

System.out.println("Month " + i + " payment: " + monthlyPayment(amountBorrowed, loanLength, percentage));

关于java - 无法显示变量，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19697066/