Java学习(判断质数、猜数字游戏、购买飞机票）

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Java学习(判断质数、猜数字游戏、购买飞机票）

判断质数

package test;import java.util.Arrays;
import java.util.Scanner;public class test1 {public static void main(String[] args){Scanner sc = new Scanner(System.in);int num = sc.nextInt();//定义标志位boolean flag = true;for (int i = 2; i < num; i++) {if (num % i == 0) {flag = false;break;}}if(flag){System.out.println(num+"是一个质数");}else{System.out.println(num+"不是一个质数");}}
}

猜数字游戏

package test;import java.util.Random;
import java.util.Scanner;public class test2 {public static void main(String[] args) {Random r = new Random();//1.生成随机数字int number = r.nextInt(100)+1;//2.猜一猜数字是多少Scanner sc = new Scanner(System.in);while(true){System.out.println("请输入你要猜的数字：");int guessNumber = sc.nextInt();//3.判断数字的大小if (guessNumber > number) {System.out.println("大了！");}else if (guessNumber < number) {System.out.println("小了！");}else{System.out.println("猜中了！");break;}}}
}

购买飞机票

package test;import java.sql.SQLOutput;
import java.util.Scanner;public class test2 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入原票价：");int ticket = sc.nextInt();System.out.println("请输入月份:");int month = sc.nextInt();System.out.println("请输入购买的舱位：0 头等舱  1经济舱");int seat = sc.nextInt();if(month >= 5&&month <= 10){ticket = getTicket(ticket,seat,0.9,0.85);}else if((month >= 1&& month <= 4)||(month >= 11&&month <=12)){ticket = getTicket(ticket,seat,0.7,0.65);}else{System.out.println("输入的月份不合法");}System.out.println(ticket);}public static int getTicket(int ticket,int seat,double v1,double v2) {if (seat == 0) {ticket = (int)(ticket*v1);}else if (seat == 1) {ticket = (int)(ticket*v2);}else{System.out.println("没有这种舱位");}return ticket;}
}