Question

我正在尝试通过添加久坐，Somewhat_Active，Active和Very_Active来计算BMR。代码将编译但不会计算。这是第一次尝试，所以任何建议都是有帮助的。我已经成功创建了没有添加类别的BMR，但现在我无法进行计算。在尝试添加MaleBMR之前，我试图让FemaleBMR首先工作

import java.util.Scanner;

public class BMR2

{ 
  public static void main(String[] args)
  {

    Scanner kybd = new Scanner(System.in);

    System.out.print("Enter Height: ");

    double Height = kybd.nextDouble ();

    System.out.print("Enter Weight: ");

    Double Weight = kybd.nextDouble ();

    System.out.print("Enter Age: ");

    int Age = kybd.nextInt ();

    double FemaleBMR = 655 + 4.3 * Weight + 4.7 * Height - 6.8 * Age;

    double MaleBMR = 66 + (6.3 * Weight) + (12.9 * Height) - (6.8 * Age);

    int choc = 230;
    System.out.println("Are you Sedentary, Somewhat_Active, Active, or Very_Active?: ");
    boolean Sedentary = kybd.nextBoolean ();
    boolean Somewhat_Active = kybd.nextBoolean();
    boolean Active = kybd.nextBoolean ();
    boolean Very_Active = kybd.nextBoolean ();

    if (Sedentary)
      System.out.println("chocolate bars for female: "+ FemaleBMR*1.2/choc);

    else if (Somewhat_Active)
    System.out.println("chocolate bars for female: "+ FemaleBMR*1.3/choc);

    else if (Active)
      System.out.println("chocolate bars for female: "+FemaleBMR*1.4/choc);

    else if (Very_Active)
      System.out.println("chocolate bars for female: "+FemaleBMR*1.5/choc);

    }
    }

编译但不会计算屈服

java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:840)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextBoolean(Scanner.java:1756)
at BMR2.main(BMR2.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)

Answer 1

我很怀疑这张海报是在塞拉学院为DoBeck教授的CS12或CS13课程做实验课。我现在正在他班上做同样的事情。

反正，

您应该首先在顶部声明您的字段。使其更易读，更容易调试/维护。

更改Double Weight = kybd.nextDouble（）;加倍= kybd.nextDouble（）;

对于生活方式选择评估者（久坐，活跃，非常活跃），请使用switch语句。

在此处了解switch语句：http://docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html

以下是我的版本。注意注释中的空格和适当的文档，以使代码更易读，易懂和易于维护。

//代码开始

import java.util.Scanner;

公共类BMRCalculator

{

public static void main（String args []）

{

//字段

double BMRMale, BMRFemale; // male and female bmr calculation fields

double height; // inches
double weight; // pounds (lbs)

final int maleOption = 1;

final int femaleOption = 2;

int userChoice;

int age = 0;


Scanner kb = new Scanner ( System.in ); // creates a keyboard scanner object called: kb   


  System.out.print("What is your age: ");

  age = kb.nextInt();


  System.out.print("Enter your height (inches): ");

  height = kb.nextDouble();

  System.out.print("Enter your weight (pounds): ");

  weight = kb.nextDouble();




  // male or female gender selction prompt

  System.out.print ("Enter 1 for male or 2 for female gender selection: ");

  userChoice = kb.nextInt();

/ *

* 卡路里燃烧计算：

* 哈里斯本尼迪克特方法

* BMR男子：= 66 +（6.23 X体重磅）+（12.7 X身高（英寸）） - （6.8 X年龄）

* BMR女性：= 655 +（4.35 X体重磅）+（4.7 X高度（英寸）） - （4.7 X年龄）

* /

if（userChoice＆gt; = 1＆amp;＆amp; userChoice＆lt; = 2）

{

  switch( userChoice )

  {
     case maleOption:

 //  BMR Men: = 66 + (6.23 X weight in pounds) + (12.7 X height in inches) – (6.8 X age)

     BMRMale = 66 + (6.23 * weight) + (12.7 * height) - (6.8 * age);

     System.out.println ("Your Male BMR is: " + BMRMale );


     break; // break out of maleOption


     case femaleOption:

// BMR Women: = 655 + (4.35 X weight in pounds) + (4.7 X height in inches) – (4.7 X age)


     BMRFemale = 655 + ( 4.35 * weight ) + (4.7 * height ) - (4.7 * age );

     System.out.println ("Your Female BMR is: " + BMRFemale );

     break; // break out of femaleOption




  } // end switch case

} //结束if block

else //如果未输入1或2，则显示错误。

{

     System.out.println("Invalid gender choice. Please enter 1 for male, 2 for female !");



} // end if .. else block

} //结束主要

} //结束课

使用额外的if语句计算BMR？

1 个答案: