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：

   ...

   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");

   // call corresponding method to calculate:

   convertToInches();

   bmiCalculator();

   weightStatus();

   // now all of those method are executed.

   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。

...   

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() {

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

}