元旦作业 1~6题

package cn.yang.qian.qian;import java.util.Scanner;public class average1 {public static void main(String[] args) {// 第一题 计算平均分Scanner input = new Scanner(System.in);System.out.println("请输入语文成绩");double Chinese = input.nextDouble();System.out.println("请输入数学成绩");double Math = input.nextDouble();System.out.println("请输入英语成绩");double English = input.nextDouble();double sum = Chinese + Math + English;double average = sum / 3;System.out.println("总成绩是:" + sum);System.out.println("平均分是:" + average);}
}package cn.yang.qian.qian;public class shopping2 {public static void main(String[] args) {// 第二题 购物清单int bagPrice = 198;int badmintonPrice = 90;int battledorePrice = 400;System.out.println("********** 购 物 清 单 **********");System.out.println("商品名称" + "\t" + "单价" + "\t" + "数量" + "\t" + "总价");System.out.println("登山包" + "\t" + "￥" + bagPrice + "\t" + "1" + "\t"+ "￥" + bagPrice * 1);System.out.println("羽毛球" + "\t" + "￥" + badmintonPrice + "\t" + "3"+ "\t" + "￥" + badmintonPrice * 3);System.out.println("羽毛球拍" + "\t" + "￥" + battledorePrice + "\t" + "1"+ "\t" + "￥" + battledorePrice * 1);System.out.println("==============================");int sum = bagPrice * 1 + badmintonPrice * 3 + battledorePrice * 1;int money = 8888;int change = money - sum;System.out.println("应付金额:" + sum + "元");System.out.println("实收金额:" + money + "元");System.out.println("找零:" + change + "元");}
}package cn.yang.qian.qian;import java.util.Scanner;public class performance3 {public static void main(String[] args) {// 第三题 接收成绩 分等级double student[] = new double[10];double sum = 0;// 总成绩double score = 0;// 平均分Scanner input = new Scanner(System.in);for (int i = 0; i < student.length; i++) {System.out.println("请输入第" + (i + 1) + "名学生的成绩");student[i] = input.nextDouble();if (student[i] > 100 || student[i] < 1) {System.out.println("输入成绩无效");break;}sum = sum + student[i];score = sum / 10;}if (score >= 1) {int a = (int) score / 10;switch (a) {case 10:case 9:System.out.println("该班级学员等级为A");break;case 8:System.out.println("该班级学员等级为B");break;case 7:System.out.println("该班级学员等级为C");break;case 6:System.out.println("该班级学员等级为D");break;case 5:case 4:case 3:case 2:case 1:case 0:System.out.println("该班级学员等级为E");break;}}}
}package cn.yang.qian.qian;public class test4 {public static void main(String[] args) {// 第四题 输出1~1000之间5的倍数 并统计个数int conut = 0;System.out.println("1~1000之间5的倍数为:");for (int i = 1; i <= 1000; i++) {if (i % 5 != 0) {continue;} else {conut++;if (conut % 8 == 0) {System.out.println(i);} else {System.out.print(i + "\t");}}}System.out.println("1~1000之间5个倍数一共有" + conut + "个");}
}package cn.yang.qian.qian;import java.util.Arrays;
import java.util.Scanner;public class test5 {public static void main(String[] args) {// 第五题 录入成绩 按降序排列int student[] = new int[10];int a = 0;int b = 0;int c = 0;Scanner input = new Scanner(System.in);System.out.println("学员成绩统计表");for (int i = 0; i < student.length; i++) {System.out.println("请输入第" + (i + 1) + "个学员的成绩");student[i] = input.nextInt();}System.out.println("********************************");System.out.println("降序输出所有成绩为:");Arrays.sort(student);// 排序for (int i = student.length - 1; i >= 0; i--) {System.out.print(student[i] + " ");if (student[i] >= 80 && student[i] <= 100) {a++;}if (student[i] >= 60 && student[i] < 80) {b++;}if (student[i] < 60) {c++;}}System.out.println("\t");System.out.println("********************************");System.out.println("其中:");System.out.println("100分--80分的学员有:" + a + "个");System.out.println("79分--60分的学员有:" + b + "个");System.out.println("60分以下的学员有:" + c + "个");}
}package cn.yang.qian.qian;import java.util.Arrays;
import java.util.Scanner;public class test6 {public static void main(String[] args) {// 输入数据 判断是否存在数组中int qianqian[] = new int[5];Scanner input = new Scanner(System.in);for (int i = 0; i < qianqian.length; i++) {System.out.println("请输入第" + (i + 1) + "个数字");qianqian[i] = input.nextInt();}System.out.print("所接受的数字为:[");for (int qian : qianqian) {System.out.print(qian + ",");}System.out.println("]");System.out.println("请输入查询数字");int number = input.nextInt();int count = Arrays.binarySearch(qianqian, number);if (count == -1) {System.out.println("该数字不存在与本数组中");} else {System.out.println("该数字是本数组中第:" + (count + 1) + "个成员");}String str = Arrays.toString(Arrays.copyOf(qianqian, number));if (count == 0) {System.out.println("该数字前无数据");} else {System.out.println("该数字前的数组内容为:" + str);}}
}

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