Java作业五（2017-10-15）

　　/*3-2.程序员：龚猛
　　　　第三章全部例题*/

package zhenshu;
import java.util.Scanner;
public class practise {

    public static void main(String[] args) {
        int number1 = (int)(Math.random() * 10);
        int number2 = (int)(Math.random() * 10);
        
        if(number1 < number2) {
            int temp = number1;
            number1 = number2;
            number2 = temp;
        }
        System.out.print
        ("what is" + number1 + "-" + number2 +"?");
        Scanner input = new Scanner(System.in);
        int answer = input.nextInt();
        
        if (number1 - number2 == answer)
            System.out.println("You are correct!");
        else{
            System.out.println("Your answer is wrong.");
            System.out.println(number1 + "-" + number2 + "should be" + (number1 - number2 ));
        }
    }

}

　/*3-3.*/　

package zhenshu;
import java.util.Scanner;
public class Demo {

    public static void main(String[] args) {
        Scanner input = new Scanner (System.in);
        System.out.println("Enter an integer:");
        int number = input.nextInt();
        
        if (number % 5 ==0)
            System.out.println("HiFive");
        
        if (number % 2 ==0)
            System.out.println("HiEven");

    }

}

  /*3-3*/
 1 package zhenshu;
import java.util.Scanner;
public class bmi {

    private static final char[] Obese = null;

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        
        System.out.print("Enter height in pounds:");
        double weight = input.nextDouble();
        
        System.out.print("Enter height in inches:");
        double height = input.nextDouble();
        
        final double KILOGRAMS_PER_POUND = 0.45359237;
        final double METERS_PER_INCH = 0.0254;
        
        double weightInKilograms = weight * KILOGRAMS_PER_POUND;
        double heightInMeters = height * METERS_PER_INCH;
        double bmi = weightInKilograms / (heightInMeters * heightInMeters);
        
        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 < 30)
            System.out.println("overweight");
        else
            System.out.println(Obese);
        
        
    }

}