基本Java，在方法之间传递数据

Question

我是Java的新手，正在尝试制作一个基本的体质量计算器。我的问题是我需要问问题，转换度量值，然后将它传递给另一个方法，然后在一个单独的方法中显示结果。我在下面添加了代码，但每次都返回一个1.0作为答案。

import java.util.Scanner;

public class calcBMI {

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

        System.out.print("Enter weight in pounds: ");
        double weightInPounds = keyboard.nextDouble();
        double weightInKg = (weightInPounds / 2.2);

        System.out.print("Enter height in inches: ");
        double heightInInches = keyboard.nextDouble();
        double heightInMeters = (heightInInches / 0.254);
        double resultBMI = 1;

        displayResults(resultBMI);
    }

    public static double bodyMassIndex(double weightInKg, double 
    heightInMeters)
    {
        double resultBMI = weightInKg / Math.pow(heightInMeters, 2) * 1.375;

        return resultBMI;
    }        

    public static void displayResults(double resultBMI)
    {

        System.out.printf("The calculated body mass index was: " + resultBMI);

        System.out.println();
    }
}

更新的代码，现在正在获取；输入体重（磅）：180输入身高（英寸）：68计算出的体重指数为：1.1415618118905313 E-5建立成功（总时间：3秒）

import java.util.Scanner;

public class calcBMI {

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

        System.out.print("Enter weight in pounds: ");
        double weightInPounds = keyboard.nextDouble();
        double weightInKg = (weightInPounds / 2.2);

        System.out.print("Enter height in inches: ");
        double heightInInches = keyboard.nextDouble();
        double heightInMeters = (heightInInches / 0.0254);


        displayResults(bodyMassIndex(weightInKg, heightInMeters));
    }

public static double bodyMassIndex(double weightInKg, double heightInMeters)
    { 
        return (weightInKg / Math.pow(heightInMeters, 2));
    }        

public static void displayResults(double resultBMI)
    {

        System.out.printf("The calculated body mass index was: " + resultBMI);

        System.out.println();
    }
}

Answer 1

您得到1.0是因为您将它硬编码成这样。

更改此：

double resultBMI = 1;

致：

double resultBMI = bodyMassIndex(weightInKG, heightInMeters);

public static double bodyMassIndex(double weightInKg, double heightInMeters)
{
    return (weightInKg / (heightInMeters*heightInMeters));
} 

double heightInMeters = (heightInInches * 0.0254);