22班笔记

输出语句练习；变量练习；
public static void main(String[] args) {
String a = "刘宴洲", i = "我超爱学习";
int b = 20;
char c = '男';

System.out.println("姓名:"+a);
System.out.println();
System.out.println();
System.out.println("年龄："+b);
System.out.println("性别："+c);
System.out.println("\t"+i);

}

键盘录入：| if判断语句
1：import java.util.Scanner;

public class Demo_03_01 {
public static void main(String[] args) {
int sjs =(int)(Math.random()*10);
System.out.println(sjs);
Scanner lol = new Scanner(System.in);
System.out.println("我行我素购物管理系统>幸运抽奖");
System.out.println();
System.out.print("请输入4位会员号：");
int a = lol.nextInt();
boolean op = (a%1000)/100==sjs;
if (op) {
System.out.println(a+"号客户是幸运客户,奖励Mp4一个");

} else {
System.out.println(a+"号客户不是幸运客户,再接再厉");

}
}

}
2：剪刀石头布
import java.util.Scanner;

public class Demo_03_02 {
public static void main(String[] args) {
Scanner sc =new Scanner(System.in);
System.out.println("请输入你出的拳：1：剪刀，2：石头，3：布");
int a = sc.nextInt();
int b =(int) (Math.random()*3)+1;
if (a==b) {
System.out.println("平局。");
} else {
if ((a == 1&&b==3)||(a==2&&b==1)||(a==3&&b==2)) {
System.out.println("你赢了！");
} else {
System.out.println("你输了！");

}

}
}
}
3：利息
import java.util.Scanner;

public class Demo_2_03 {
public static void main(String[] args) {
Scanner jjjjj = new Scanner(System.in);
System.out.println("请输入本金");
int benjin = jjjjj.nextInt();
System.out.println("本金为："+benjin+"元");
double lixi1 = 0.0225;
double lixi2 = 0.027;
double lixi3 = 0.0324;
double lixi4 = 0.036;
double nian1 = benjin+benjin*lixi1;
double nian2 = benjin+ benjin*lixi2*2;
double nian3 = benjin + benjin * lixi3*3;
double nian5 = benjin+benjin*lixi4*5;
System.out.println("存一年的本息是："+nian1);
System.out.println("存两年的本息是："+nian2);
System.out.println("存三年的本息是："+nian3);
System.out.println("存五年的本息是："+nian5);
}

4：会员打折
import java.util.Scanner;

public class Demo_03_04 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入是否是会员y/n");
String answer = sc.next();
System.out.println("请输入购物金额：");
int money = sc.nextInt();
if ("y".equals(answer)) {
if (money>200) {
money*=0.75;
} else {

}

} else {
if (money>100) {
money*=0.9;
} else {

}

}System.out.println(money);

}

}