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("ÍøÇòЬÕÛ¿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);
}
}