Java关于%判断符、String比较、switch和多重if的练习题

import java.util.Random;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
//  Q1
//        a) Determine whether 3x8=27.
        System.out.print("--------------------------------------------------------\n1.\na)\n");
        final int x = 3, y = 8;
        if (x*y==27){
            System.out.println("3 x 8 = 27");
        }else{
            System.out.print(x +"*" + y + "=" + x*y +"\n");
        }

//        b) Determine whether an input integer is an odd number or even number.
        System.out.println("b)");
        int number;
        Scanner s = new Scanner(System.in);
        System.out.print("Please input a random integer : ");
        try{
            number = s.nextInt();
            if (number % 2 == 0){
                System.out.println("You inputted an even number.");
            }else{
                System.out.println("You inputted an odd number.");
            }

        }catch(Exception e){
            System.out.println("Wrong value, exiting...");
        }

//        c) Determine whether a character is a capital letter.
        Scanner s1 = new Scanner(System.in);
        System.out.println("c)");
        System.out.print("Please input a character : ");
        String character = s1.next();
        if (Character.isUpperCase(character.charAt(0))){
            System.out.println("Upper Case");
        }else if (Character.isLowerCase(character.charAt(0))){
            System.out.println("Lower Case");
        }else{
            System.out.println("It is not characters.");
        }

//        d) Display two strings in alphabetical order ignoring their case.
        System.out.println("d)");
        String string1 = "QbjewqjWNFI",string2 = "qaoei12mvao";
        if (string1.compareToIgnoreCase(string2)<0){
            System.out.println(string1 + ", " + string2);
        }else{
            System.out.println(string2 + "," + string1);
        }

//        e) A switch statement that display Sunday, Monday, .., Saturday if the input is 0, 1, …, 6.
        System.out.println("e)");
        Scanner s2 = new Scanner(System.in);
        System.out.print("Please input a number : ");
        switch (s2.nextInt()+1){
            case 1:
                System.out.println("Sunday");
                break;
            case 2:
                System.out.println("Monday");
                break;
            case 3:
                System.out.println("Tuesday");
                break;
            case 4:
                System.out.println("Wednesday");
                break;
            case 5:
                System.out.println("Thursday");
                break;
            case 6:
                System.out.println("Friday");
                break;
            case 7:
                System.out.println("Saturday");
                break;
            default:
                System.out.println("Wrong number");
        }

//  Q2
        System.out.println("--------------------------------------------------------\n2.");
//        a)
        System.out.print("a)\nThe first line should be /if (num1 == num2)/\n");
//        b)
        System.out.print("b)\nThe first line should be /if(x>y && y>z)/\n");
//        c)
        System.out.print("c)\nThe second line should be /if(s1.equals(s2))/\nThe fourth line should be /else if (!s1.equals(s2))/\n");
//        d)
        System.out.print("d)\nThe first line should be /if (x>0||y>0)\n");

//  Q3
        System.out.println("--------------------------------------------------------\n3.");
//        a)
        System.out.println("a)\n#####\n$$$$$");
//        b)
        System.out.println("b)\n#####\n$$$$$");
//        c)
        System.out.println("c)\n$$$$$");
//        d)
        System.out.println("d)\nThere is no output.");

//  Q4   Write the java statements that used the if statement to find the biggest number among three given integers.
        System.out.println("--------------------------------------------------------\n4.");
        Random r = new Random();
        final int MAX = 100;
        int given1 = r.nextInt(MAX);
        int given2 = r.nextInt(MAX);
        int given3 = r.nextInt(MAX);
        System.out.println("given1 = "+ given1 + "\ngiven2 = " + given2+"\ngiven3 = "+given3);
        if (given1 >given2 && given2>given3){
            System.out.println("The biggest number is given1 : "+ given1);
        }else if (given1>given2 && given2<=given3){
                if (given1 > given3){
                    System.out.println("The biggest number is given1 : " + given1);
                }else if (given1 < given3){
                    System.out.println("The biggest number is given3 : "+ given3);
                }else{
                    System.out.println("The biggest number is given1 or given3 : " +given1);
                }
        }else if (given1 < given2 && given2 > given3){
            System.out.println("The biggest number is given2 : " + given2);
        }else if (given1 <= given2 && given2 < given3){
            System.out.println("The biggest number is given3 : " + given3);
        }else{
            System.out.println("The three numbers are the same : " + given1);
        }
//  Q5 Write the java statements that determine whether the Leap year. A Leap year is divisible by 4 but not by 100. However, a Leap year is also divisible by 400.
        System.out.println("--------------------------------------------------------\n5.");
        System.out.print("Please input a year : ");
        Scanner s3 = new Scanner(System.in);
        int year = s3.nextInt();
        if (year % 4 == 0){
            if (year %100 != 0){
                System.out.println(year + " is a Leap year.");
            }else{
                if (year %400 ==0){
                    System.out.println(year + " is a Leap year.");
                }else{
                    System.out.println(year + " is not a Leap year.");
                }
            }
        }else{
            System.out.println(year + " is not a Leap year.");
        }
    }
}