Chapter 3 Selection Structure (1)

1. Move the chair

package com.bdqn.demo;


import java.util.Scanner;

public abstract class Name {
     public static void main(String[] args) {
  Scanner input = new Scanner (System.in);
  System.out.println("Please enter age: ");
  int age = input.nextInt();
  System.out.println("Please enter gender: ");
  String sex = input.next();
  if((age>=7)||(age>=5&&sex.equals("male"))){   //Use the if structure to judge
    System.out.println("Can move the table");
  }else {System.out.println("Cannot move the table");}
 }
}

2, digital output arrangement

package com.baqn.demo;


import java.util. *;


public class Shu {


	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("Please enter 3 integers: ");
		int a = input.nextInt();
		int b = input.nextInt();
		int c = input.nextInt();
		if (a < b && a < c) {
			if (b < c) {
				System.out.print(a + "," + b + "," + c);
			}


			else {


				System.out.print(a + "," + c + "," + b);
			}
		} else if (b < a && b < c) {
			if (a < c) {
				System.out.println(b + "," + a + "," + c);
			} else {
				System.out.print(b + "," + c + "," + a);


			}
		} else {
			if (a < b) {
				System.out.print(c + "," + a + "," + b);
			} else {
				System.out.print(c + "," + b + "," + a);
			}
		}


	}
}

3. Divide by

package com.bdqn.demo;


import java.util. *;


public class Shu {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.println("Please enter your integer: ");
		int Num = input.nextInt();


		if (Num % 3 == 0 && Num % 5 == 0) {
			System.out.println("The integer is a multiple of 3 or 5");
		} else {
			System.out.println("The integer is not divisible by either 3 or 5");
		}
	}
}

4. Rewards

package com.bdqn.demo;


import java.util.Scanner;

public class Score {
    public static void main(String[] args) {
  Scanner input = new Scanner(System.in);
  System.out.println("Please enter Xiaoming's test score: ");
  int score = input.nextInt();
  if(score==100) {
   System.out.println("Buy you a car");
  }else if(score>=90) {
   System.out.println("Buy you mp4");
  }else if(score>=60) {
   System.out.println("Buy you this reference book");
  }else {
   System.out.println("Nothing!");
  }
 }
}

4,, book a flight ticket

package com.bdqn.demo;


import java.util.Scanner;


public class Plane
{
  public static void main(String[] args)
  {
    Scanner input = new Scanner(System.in);
    double money = 5000.0D;
    System.out.println("Please enter the month you travel: ");
    int yue = input.nextInt();
    System.out.println("Please choose first class or economy: first class choose 1, economy choose 2");
    int choose = input.nextInt();
    if ((yue > 3) && (yue < 11)) {
      if (choose == 1) {
        money *= 0.9D;
      }
      else if (choose == 2)
        money *= 0.8D;
    }
    else {
      if (choose == 1)
        money *= 0.5D;
      if (choose == 2) {
        money *= 0.4D;
      }
    }

    System.out.println("Your ticket price is: " + money);
  }
}