第三章第六题（健康应用：BMI）(Health application: BMI)

*3.6（健康应用：BMI）修改程序清单3-4，让用户输入重量、英尺和英寸。例如一个人身高是5英尺10英寸，输入的英尺值就是5、英寸值为10。注意：1英尺=0.3048米。

下面是一个运行示例：
Enter weight in pounds:140
Enter feet:5
Enter inches:10
BMI is 20.087702275404553

*3.6(Health application: BMI) Revise Listing 3.4, ComputeAndInterpretBMI.java, to let the user enter weight, feet, and inches. For example, if a person is 5 feet and 10 inches, you will enter 5 for feet and 10 for inches.

Here is a sample run:
Enter weight in pounds:140
Enter feet:5
Enter inches:10
BMI is 20.087702275404553

下面是参考答案代码:

import java.util.*;

public class ComputeAndInterpretBMIQuestion6 {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		// Prompt the user to enter weight in pounds
		System.out.print("Enter weight in pounds: ");
		double weight = input.nextDouble();
		
		// Prompt the user to enter feet
		System.out.print("Enter feet: ");
		double feet = input.nextDouble();
				
		// Prompt the user to enter inches
		System.out.print("Enter inches: ");
		double inches = input.nextDouble();

		final double KILOGRAMS_PER_POUND = 0.45359237; // Constant
		final double METERS_PER_INCH = 0.0254; // Constant

		// Compute BMI
		double weightInKilograms = weight * KILOGRAMS_PER_POUND;
		double heightInMeters = (feet * 12 + inches) * METERS_PER_INCH;
		double bmi = weightInKilograms / (heightInMeters * heightInMeters);

		// Display result
		System.out.println("BMI is " + bmi);
		if (bmi < 18.5)
			System.out.println("Underweight");
		else if (bmi < 25)
			System.out.println("Normal");
		else if (bmi < 25)
			System.out.println("Overweight");
		else
			System.out.println("Obese");
		
		input.close();
	}
}

运行效果：

注：编写程序要养成良好习惯
如：1.文件名要用英文，具体一点
2.注释要英文
3.变量命名要具体，不要抽象（如:a,b,c等等），形式要驼峰化
4.整体书写风格要统一（不要这里是驼峰，那里是下划线，这里的逻辑段落空三行，那里相同的逻辑段落空5行等等）

来源：CSDN

作者：xjlovewjh

链接：https://blog.csdn.net/xjlovewjh/article/details/104171278