第三章 选择结构(一)

1，搬椅子

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("请输入年龄：");
  int age = input.nextInt();
  System.out.println("请输入性别：");
  String sex = input.next();
  if((age>=7)||(age>=5&&sex.equals("男"))){  //使用if结构判断
   System.out.println("能搬动桌子");
  }else {System.out.println("不能搬动桌子");}
 }
}

2，数字输出排列

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("请输入3个整数:");
		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，整除

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("请输入你的整数：");
		int Num = input.nextInt();


		if (Num % 3 == 0 && Num % 5 == 0) {
			System.out.println("该整数是3或5的倍数");
		} else {
			System.out.println("该整数不能被3或5中的任何一个数整除");
		}
	}
} 

4，奖励

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("请输入小明的考试成绩：");
  int score = input.nextInt();
  if(score==100) {
   System.out.println("给你买车");
  }else if(score>=90) {
   System.out.println("给你买mp4");
  }else if(score>=60) {
   System.out.println("给你买本参考书");
  }else {
   System.out.println("什么都没有！");
  }
 }
}

4,，订购机票

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("请输入您出行的月份：");
    int yue = input.nextInt();
    System.out.println("请问您选择头等还是经济：头等选1，经济选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("您的机票价格为：" + money);
  }
}