10.9作业--林枫

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3-1

import java.util.Scanner;

public class AdditionQuiz
{
　　public static void main(String[] args)
　　{
　　　　int number1=(int)(System.currentTimeMillis()%10);
　　　　int number2=(int)(System.currentTimeMillis()/7%10);
　　　　Scanner input=new Scanner(System.in);

　　　　System.out.print(
　　　　　　"What is "+number1+"+"+number2+"?");
　　　　int answer = input.nextInt();
　　　　System.out.println(
　　　　　　number1+"+"+number2+"="+answer+" is "+(number1+number2==answer));
　　}
}

3-2

import java.util.Scanner;

public class SimpleIfDemo
{
　　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

import java.util.Scanner;

public class SubtractionQuiz
{
   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));
       }
   }
}

3-4

import java.util.Scanner;

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

       System.out.print("Enter weight in kilograms:");
       double weight = input.nextDouble();

       System.out.print("Enter height in meters:");
       double height = input.nextDouble();

       double bmi = weight/(height * height);

       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");
   }
}

3-6

import java.util.Scanner;

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

       System.out.print("Enter an integer:");
       int number = input.nextInt();
       if (number % 2 == 0 && number % 3 ==0)
           System.out.println(number + " is divisible by 2 and 3.");
       if (number % 2 == 0 || number % 3 ==0)
           System.out.println(number + " is divisible by 2 or 3.");
       if (number % 2 == 0 ^ number % 3 ==0)
           System.out.println(number + " is divisible by 2 or 3, but not both.");
   }
}

3-7

import java.util.Scanner;

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

       System.out.print("Enter a year:");
       int year = input.nextInt();
       boolean isLeapYear = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
           System.out.println(year + " is a leap year?" + isLeapYear);
   }
}