java第二章

知识点丶

package com.bdqn.technology;

public class Demo3 {

   public static void main(String[] args) {
       /**
       * ctrl + shift + c 注释选中的代码
       */
//       int a = 10;
//       int b = 5;
//       /**
//       * 求余
//       */
//       int c = (a % b);
//       System.out.println(c);
//
//
//       int r = 5;
//
//       double result = (Math.PI * r * r);
//       System.out.println(result);
       /**
       * double > int double类型的级别比int类型的级别要高
       *
       * 低级别的类型能够自动转换成高级别的类型
       */
//       double a = 81.29;
//       int b = 2;
//       double c = (a + b);


//       double a = 2;

       /**
       * 低级别类型不能自动转换成高级别类型
       */
//       int b = 2.0;

       /**
       * 每一个字符都会对应一个唯一的整数
       * char < int char类型级别比int要低所以char类型数据能够自动转换成int类型的数据
       */
//       int c = 'B';
//       System.out.println(c);

       /**
       * 如果高级别类型数据想要转换成低级别类型数据称之为强制转换
       * (输入你想要转换的类型)
       * 转换的到的结果是整数部分
       */
       double a = 2.6;
       int b = (int)a;
       System.out.println(b);
   }

}

一丶纸牌互换

package com.bdqn.demo;

import java.util.Scanner;

public class Zhipai {
   public static void main(String[] args) {
       Scanner scanner = new Scanner(System.in);

   System.out.println("输出互换前手中的纸牌：");
   System.out.print("右手中的纸牌:");
   double zhipai = scanner.nextDouble();

   System.out.print("左手中的纸牌：");
   double zuoshou = scanner.nextDouble();

   System.out.println("\n输出呼唤后手中的纸牌:");
   System.out.println("左手中的纸牌"+zhipai);
   System.out.println("右手中的纸牌"+zuoshou);
   }

}
二丶本金利息

package com.bdqn.demo;

import java.util.Scanner;

public class Benjin {
   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
       System.out.println("请输入本金：");
       double diyi = 0.0225;
       double ernen = 0.027;
       double shann = 0.0324;
       double wunen =0.036;
       int benjin = input.nextInt();
       double qwer=benjin*diyi;
       double wert=benjin*ernen*2;
       double erty=benjin*shann*3;
       double rtyu=benjin*wunen*5;
       System.out.println("本金为:"+benjin);
       System.out.println("存取一年后的本息是："+(qwer+benjin));
       System.out.println("存取两年后的本息是："+(wert+benjin));
       System.out.println("存取三年后的本息是："+(erty+benjin));
       System.out.println("存取五年后的本息是："+(rtyu+benjin));
   }

}
三丶购物折扣

package com.bdqn.demo;

import java.util.Scanner;

public class Zhekou {
public static void main(String[] args) {
   int txjg = 245;
   int wqxjg = 570;
   int wqpjg = 320;
   System.out.println("ÇëÊäÈëÕÛ¿Û£º");
   Scanner input =new Scanner(System.in);

   double zhekou=input.nextDouble();
   double txjg1=(txjg*zhekou);
   double wqxjg1=(wqxjg*zhekou);
   double wqpjg1=(wqpjg*zhekou);
   boolean txjg2=txjg1<100;
   boolean wqxjg2=wqxjg1<100;
   boolean wqpjg2=wqpjg1<100;
   System.out.println("TÐôÕÛ¿ÛµÍÓÚ100Âð£¿"+txjg2);
   System.out.println("ÍøÇòÐ¬ÕÛ¿ÛµÍÓÚ100Âð£¿"+wqxjg2);
   System.out.println("ÍøÇòÅÄÕÛ¿ÛµÍÓÚ100Âð£¿"+wqpjg2);


}
}
三丶购物抽奖

package com.bdqn.demo;

import java.util.Scanner;

public class Choujiang {
public static void main(String[] args) {


   int custNo;
   System.out.println("请输入四位会员卡号：");

   Scanner input = new Scanner(System.in);
   custNo = input.nextInt();

   int gewei = custNo%10;
   int shiwei = custNo/10%10;
   int baiwei = custNo/100%10;
   int qianwei = custNo/1000;

   int sum = gewei+shiwei+baiwei+qianwei;
   System.out.println("会员卡号"+custNo+"各位之和"+sum);
   boolean isLuck=sum>20;
   System.out.println("是幸运客户没？"+isLuck);
}
}
四丶购物积分

package com.bdqn.demo;

import java.util.Scanner;

public class Teso {
   public static void main(String[] args) {
       System.out.println("***************消费单***************");
       System.out.println("购买物品\t\t单价\t个数\t金额");
       System.out.println("T恤\t\t$245\t2\t$490");
       System.out.println("网球鞋\t\t$570\t1\t$570");
       System.out.println("网球拍\t\t$320\t1\t$320");
       System.out.println("\n折扣：\t\t8折");
       int shirtPrice = 245; //T恤价格
       int shoePrice = 570; //网球鞋价格
       int padPrice = 320; //网球拍价格
       int momey=1500; //实际交费
       int shirtNo=2; //T恤数
       int shoeNo=1; //网球鞋数目
       int padNo=1; //网球拍数目
       double discount = 0.8;
       double finalpay = (shirtPrice*shirtNo
               +shoePrice*shoeNo+padPrice*padNo)*discount;//计算消费总金额
       double returnMoney=momey-finalpay;
       double score=(int)finalpay*3/100;
       System.out.println("消费总金额\t￥"+finalpay);
       System.out.println("实际交费\t\t￥"+momey);
       System.out.println("找钱\t\t￥"+returnMoney);
       System.out.println("本次购物所获的积分是："+score);


   }
}
五丶购物结算

package com.bdqn.demo;
public class Gouwu {
public static void main(String[] args) {
       int shirtPrice = 245; //T恤价格
       int shoePrice = 570; //网球鞋价格
       int padPrice = 320; //网球拍价格
       int shirtNo=2; //T恤数
       int shoeNo=1; //网球鞋数目
       int padNo=1; //网球拍数目
       double discount = 0.8;
       double finalpay = (shirtPrice*shirtNo
               +shoePrice*shoeNo+padPrice*padNo)*discount;//计算消费总金额
       System.out.println("消费总金额；"+finalpay);
   }
}
六丶成绩

package com.bdqn.demo;

import java.util.Scanner;

public class Title {

   public static void main(String[] args) {
       /**
       * scanner
       */
       Scanner scanner = new Scanner(System.in);
       System.out.print("请输入java成绩:");
       //读取用户输入的数据
       int javaScore = scanner.nextInt();

       System.out.print("请输入SQL成绩:");
       //读取用户输入的数据
       int sqlScore = scanner.nextInt();

       System.out.print("请输入STB成绩:");
       //读取用户输入的数据
       int stbScore = scanner.nextInt();

       int score1 = javaScore - sqlScore;
       System.out.println("java成绩与sql成绩之差是:"+score1);

       int totalScore = (javaScore + sqlScore +stbScore);
       /**
       * 如果两个整数相除得到的结果一定是整数如果有小数直接省略
       */
       int usa = totalScore / 3;
       System.out.println("平均分是:"+usa);
   }

}

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