我现在卡住了，我的程序应该正常工作，除非它为 BMI输出返回 0.0 的值，我确定它的东西是我忽略了，但我似乎无法弄明白。 我在另一个问题上发布了相同的代码，但是现在解决了一个不同的问题。以下是类代码...任何指针都表示赞赏！我还没有接受calCompu方法，我想先让resultBMI工作......
import java.util.Scanner;
public class myPerson
{
double weight;
double height;
int age;
String gender;
double calCompu;
final double KG_WEIGHT_CONV = 2.2;
final double MT_HEIGHT_CONV = 0.0254;
public myPerson ()
{
weight = 0;
height = 0;
age = 0;
gender = " ";
}
public void setWeight (double weight) {
this.weight = weight;
}
public void setHeight (double height) {
this.height = height;
}
public void setAge (int age) {
this.age = age;
}
public void setGender (String gender) {
this.gender = gender;
}
public double getWeight () {
return weight / KG_WEIGHT_CONV;
}
public double getHeight () {
return height * MT_HEIGHT_CONV;
}
public int getAge () {
return age;
}
public String getGender () {
return gender;
}
//instance method to calculate BMI
public double bodyMassIndex()
{
double resultBMI = weight / Math.pow(height, 2);
return resultBMI;
}
public double calorieComp(double weight, double height, int age)
{
double heightInCentimeters = height * 100;
System.out.println("Select your activity level: ");
System.out.println(" 1 - Sedentary");
System.out.println(" 2 - Moderately active (light exercise 1-3 days a week) ");
System.out.println(" 3 - Active (moderate exercise 3-5 days a week) ");
System.out.println(" 4 - Very active (heavy exercise 6-7 days a week) ");
System.out.printf("Enter choice from above: ");
int aFactor;
Scanner keyboard = new Scanner( System.in );
aFactor = keyboard.nextInt();
switch (aFactor)
{
case 1:
aFactor = (int) 1.2; //Sedentary people
break;
case 2:
aFactor = (int) 1.375; //Moderate active people
break;
case 3:
aFactor = (int) 1.55; //Active people
break;
case 4:
aFactor = (int) 1.725; //Very active people
break;
default :
System.out.println("Invalid choice entered!");
}
if ("m".equals(gender))
{
//return men
double basalMetabolicRate = 13.397 * weight + 4.799
* heightInCentimeters - 5.677 * age + 88.362;
double psyActFact = basalMetabolicRate * aFactor;
calCompu = (int) Math.ceil(psyActFact);
return calCompu;
}
else
{
//return women
double basalMetabolicRate = 9.247 * weight + 3.098
* heightInCentimeters - 4.330 * age + 447.593;
double psyActFact = basalMetabolicRate * aFactor;
calCompu = (int) Math.ceil(psyActFact);
return calCompu;
}
}
}
主要班级
import java.util.Scanner;
public class MyHealthCalculator
{
public static void main(String[] args)
{
displayPurpose();
//create person object
myPerson person = new myPerson();
Scanner keyboard = new Scanner( System.in );
System.out.print("Please enter weight in pounds: ");
person.weight = keyboard.nextDouble();
System.out.print("Please enter height in inches: ");
person.height = keyboard.nextDouble();
System.out.print("Please enter your age in years: ");
person.age = keyboard.nextInt();
System.out.print("Please enter your gender (M/F): ");
person.gender = keyboard.next();
//person.bodyMassIndex(0, 0);
// person.calorieComp(0, 0, 0);
double resultBMI = person.bodyMassIndex();
displayResults(person, resultBMI, person.calorieComp(0, 0, 0));
}
public static void displayPurpose()
{
System.out.println("This program implements a Health Assistance "
+ "Calculator");
System.out.println("\nGiven a weight, height, and age, it will compute:");
System.out.println(" BMI - Body Mass Index");
System.out.println(" Calories needed per day to maintain weight");
System.out.println();
}
public static void displayResults(myPerson person, double resultBMI, double calCompu)
{
Scanner keyboard2 = new Scanner( System.in );
final double LOW_N_BMI = 18.5;
final double HI_N_BMI = 24.9;
System.out.println("\nRESULTS:");
System.out.printf("BMI in the range of " + LOW_N_BMI + " to "
+ HI_N_BMI + " is considered normal" );
//getters here, gender, age, weight kgs and height meters.
//System.out.printf("\n\nCurrent weight in kgs is: " + "%.2f", person.getWeight());
//System.out.printf("\nCurrent height in meteres: " + "%.3f", person.getHeight());
if ("m".equals(person.gender))
System.out.printf("\nYou are a " + "Male,");
else
System.out.printf("\nYou are a " + "Female,");
System.out.printf(" age " + person.age);
System.out.printf(", with a weight of " + "%.2f", person.getWeight());
System.out.printf(" kg, a height of " + "%.3f", person.getHeight());
System.out.printf(" m.");
System.out.printf("\nYour BMI is " + "%.1f", resultBMI);
if (resultBMI < LOW_N_BMI)
System.out.println(", which is below normal.");
else if (resultBMI > HI_N_BMI)
System.out.println(", which is above normal.");
else
System.out.println(", which is normal.");
System.out.printf("\n To maintain your current weight, you should consume ", calCompu, "calories per day.");
if (resultBMI < LOW_N_BMI)
{
System.out.println("Would you like to try and reach the normal range? ");
String questionOne = keyboard2.next();
if ("y".equals(questionOne))
{
System.out.println("how many pounds would you like to gain per week? ");
double questionTwo = keyboard2.nextDouble();
double gainRate = questionTwo * 3500;
System.out.println(" To gain " + questionTwo + " pound(s) per "
+ "week, you should consume " + gainRate + "Calories per day.");
}
else
{
}
}
else if (resultBMI > HI_N_BMI)
{
System.out.println("Would you like to try and reach the normal range? ");
double questionThree = keyboard2.nextDouble();
double loseRate = questionThree / 3500;
System.out.println(" To lose " + questionThree + " pound(s) per "
+ "week, you should consume " + loseRate + "Calories per day.");
}
else
{
}
}
}
示例输入/输出
run:
This program implements a Health Assistance Calculator
Given a weight, height, and age, it will compute:
BMI - Body Mass Index
Calories needed per day to maintain weight
Please enter weight in pounds: 180
Please enter height in inches: 68
Please enter your age in years: 24
Please enter your gender (M/F): m
Select your activity level:
1 - Sedentary
2 - Moderately active (light exercise 1-3 days a week)
3 - Active (moderate exercise 3-5 days a week)
4 - Very active (heavy exercise 6-7 days a week)
Enter choice from above: 2
RESULTS:
BMI in the range of 18.5 to 24.9 is considered normal
You are a Male, age 24, with a weight of 81.82 kg, a height of 1.727 m.
Your BMI is 0.0, which is below normal.
To maintain your current weight, you should consume Would you like to try and reach the normal range?
y
how many pounds would you like to gain per week?
5
To gain 5.0 pound(s) per week, you should consume 17500.0Calories per day.
BUILD SUCCESSFUL (total time: 22 seconds)
答案 0 :(得分：0)
问题是重量和高度单位之间的不匹配。你的体重是英镑，身高是英寸。在你的BMI公式中插入145磅和69英寸，你得到145 / 69^2或~ 0.03 BMI。您在输出中看到0.0，因为占位符"%.1"将输出限制为小数点后的一位数。
Modify美国单位的BMI公式。
答案 1 :(得分：0)
我知道它必须是一件我想念的简单...谢谢@Stiliyan它现在处于正常工作状态，现在让我们看看我是否可以让其余部分工作。哈哈，你们真棒！
public double bodyMassIndex()
{
double weightKg = weight / KG_WEIGHT_CONV;
double heightMeters = height * MT_HEIGHT_CONV;
double resultBMI = weightKg / Math.pow(heightMeters, 2);
return resultBMI;
}