BMI简单计算

[java]代码库

package week3;

import java.text.DecimalFormat;

import javax.swing.JOptionPane;

public class BMI {

	static String status = "";
	
	//Constructor
	public BMI() {
		// TODO Auto-generated constructor stub
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		//Define decimal place
		DecimalFormat df2 = new DecimalFormat(".##");
		
		//Define variables
		String height = JOptionPane.showInputDialog("Please enter height (m)"); //height of the person in meters
		String weight = JOptionPane.showInputDialog("Please enter weight (kg)"); //weight of the person in kgs
		
		double h = Double.parseDouble(height);
		double w = Double.parseDouble(weight);
		
		//计算BMI
		double bmi = Double.parseDouble(df2.format(w / Math.pow(h, 2)));
		
		//检查PMI Status
		
		/*
		if(bmi < 18) {
			status = "Under Weight";
		}else if(bmi>=18 && bmi <25) {
			status = "Nomal Weight";
		}else if(bmi >= 25) {
			status = "Over Weight";
		}
		*/
		
		int k = 0;
		if(bmi < 18) {
			k = 1;
		}else if(bmi>=18 && bmi <25) {
			k = 2;
		}else if(bmi >= 25) {
			k = 3;
		}
		
		switch(k) {
		case 1 :
			status = "Under Weight";
			break;
		case 2 :
			status = "Nomal Weight";
			break;
		case 3 :
			status = "Over Weight";
			break;
		}
		
		//Display result
		String msg = "Weight : " + w + "kg;\nHeight : " + h + "m;\nBMI : " + bmi + "\nStatus : " + status;
		System.out.println(msg);
		JOptionPane.showMessageDialog(null, msg);
		
	}
	
}