BMI计算器，几种方法，代码检查

Question

这是我的第一个有几种方法的程序

第一个必须将高度转换为英寸

2、计算BMI

第三次接收 BMI 并返回状态

第 4 个是主要的，必须调用输入并生成输出

问题是它不计算 BMI - 它输出 0。当我只用一种方法运行它时，它工作正常。可能出了什么问题？

package bmiCalculator;

java.util.Scanner;

public class BmiCalculator {

public static double bmi;

public static int height;

public static int feet;

public static int inches;

public static int weight;

public static String status;

  public static void convertToInches (){

    height = feet * 12 + inches;

 }

  public static void bmiCalculator (){

     bmi = (weight * 703) / (height * height);

}

    public static void weightStatus () {

        if (bmi < 18.5){

           status = "underweight"; 

         }

        else if (bmi <= 24.9){

            status = "normal";

        }

        else if (bmi <= 29.9){

            status = "overweight";

        }

        else if (bmi >= 30){

            status = "obese";

        }

    }

    public static void main (String[] args){

       System.out.println("Put your height in ft and inches"); 

       Scanner sc = new Scanner(System.in); 

       feet = sc.nextInt();

       inches = sc.nextInt();

       System.out.println("Put your weight in pounds");

       weight = sc.nextInt();

       System.out.println("Height: " + feet + " feet, " + inches + " inches");

       System.out.println("Weight: " + weight + " pounds");

       System.out.println("Your BMI is " + bmi + "category" + status);

    }

 }

Answer 1

声明这些方法并不意味着所有方法都会执行。您需要main相应地调用这些方法。例如：&nbsp; &nbsp;...&nbsp; &nbsp;System.out.println("Put your weight in pounds");&nbsp; &nbsp;weight = sc.nextInt();&nbsp; &nbsp;System.out.println("Height: " + feet + " feet, " + inches + " inches");&nbsp; &nbsp;System.out.println("Weight: " + weight + " pounds");&nbsp; &nbsp;// call corresponding method to calculate:&nbsp; &nbsp;convertToInches();&nbsp; &nbsp;bmiCalculator();&nbsp; &nbsp;weightStatus();&nbsp; &nbsp;// now all of those method are executed.&nbsp; &nbsp;System.out.println("Your BMI is " + bmi + "category" + status);将所有这些方法和属性声明为静态并不是一个好的做法。请了解OOP工作原理。

Answer 2

首先，您需要在用户输入这样的值后调用这些方法。...&nbsp; &nbsp;System.out.println("Put your weight in pounds");weight = sc.nextInt();convertToInches();bmiCalculator();weightStatus();System.out.println("Height: " + feet + " feet, " + inches + " inches");...调用方法的顺序很重要，因为它们之间存在依赖关系。此外，您需要在 BMI 除法之前将除数和被除数转换为双倍，因为 int/int = int 和 java 舍入该值。public static void bmiCalculator() {&nbsp; &nbsp; bmi = (double)(weight * 703) / (double)(height * height);}