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2022/09/15 第三周

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zyx 2022-09-15 11:01:05 +08:00
parent 81a1888519
commit a74680ee76
8 changed files with 262 additions and 1 deletions
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1
.idea/.name generated
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@ -1 +0,0 @@
Demo1.java

1
.idea/modules.xml generated
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@ -3,6 +3,7 @@
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/Week2/Week2.iml" filepath="$PROJECT_DIR$/Week2/Week2.iml" />
<module fileurl="file://$PROJECT_DIR$/Week3/Week3.iml" filepath="$PROJECT_DIR$/Week3/Week3.iml" />
<module fileurl="file://$PROJECT_DIR$/java_class.iml" filepath="$PROJECT_DIR$/java_class.iml" />
<module fileurl="file://$PROJECT_DIR$/week1/week1.iml" filepath="$PROJECT_DIR$/week1/week1.iml" />
</modules>

6
.idea/vcs.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
</component>
</project>

11
Week3/Week3.iml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

25
Week3/src/pta/Main.java Normal file
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package pta;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int[] pow = new int[10];
for (int i = 0; i < 10; i++) {
pow[i] = (int) Math.pow(i,n);
}
int begin = (int) Math.pow(10, n - 1), end = (int) (Math.pow(10, n) - 1);
for (int i = begin; i <= end; i++) {
int sum = 0, tmp = i;
while (tmp != 0) {
sum += pow[tmp%10];
tmp /= 10;
}
if (sum == i) System.out.println(sum);
}
}
}

44
Week3/src/work/Exercise1.java Normal file
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package work;
import java.util.Scanner;
public class Exercise1 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String again;
do {
int randomNumber = 1 + (int) (Math.random() * 1000);
System.out.println("I have a number between 1 and 1000. \nCan you guess my number?\nPlease type your first guess.");
boolean success = false;
int cnt = 1;
for (int i = 1; i <= 10; i++) {
int guessNumber = scanner.nextInt();
if (randomNumber == guessNumber) {
System.out.println("Excellent! You guessed the number");
success = true;
break;
} else {
if (i == 10) break;
if (guessNumber > randomNumber) {
System.out.println("Too High. Try Again.");
} else {
System.out.println("Too Low. Try Again");
}
}
cnt++;
System.out.println("Please type your guess again:");
}
if (success) {
System.out.println("Success! You have cost " + cnt + " times");
} else {
System.out.println("Sorry! You failed!\nThe answer is: " + randomNumber);
}
System.out.println("Would you like to play again (y or n)?：");
again = scanner.next();
} while ("y".equalsIgnoreCase(again));
System.out.println("Game Over! Welcome to play again!");
}
}

46
Week3/src/work/Exercise2.java Normal file
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package work;
import java.util.Scanner;
public class Exercise2 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = -1;
while (n == -1) {
System.out.println("请输入一个正整数(3<=n<=7)：");
n = checkInputNumber(scanner, 3, 7);
}
int[] pow = new int[10];
for (int i = 0; i < 10; i++) {
pow[i] = (int) Math.pow(i, n);
}
int begin = (int) Math.pow(10, n - 1), end = (int) (Math.pow(10, n) - 1);
for (int i = begin; i <= end; i++) {
int sum = 0, tmp = i;
while (tmp != 0) {
sum += pow[tmp % 10];
tmp /= 10;
}
if (sum == i) System.out.println(sum);
}
System.out.println("求解完毕！");
}
public static int checkInputNumber(Scanner scanner, int low, int high) {
String input = scanner.next();
try {
int opt = Integer.parseInt(input);
if (opt >= low && opt <= high)
return opt;
else {
System.out.println("输入无效，只能输入" + low + "-" + high);
}
} catch (NumberFormatException e) {
System.out.println("输入无效，只能输入" + low + "-" + high);
}
return -1;
}
}

129
Week3/src/work/Exercise3.java Normal file
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package work;
import java.util.Arrays;
import java.util.Scanner;
public class Exercise3 {
static int[] score = null;
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (true) {
int opt = menu(scanner);
switch (opt) {
case 1:
input(scanner);
break;
case 2:
if (score == null) {
System.out.println("请先输入分数，然后执行该功能");
break;
}
System.out.println("班级平均成绩是：" + avgScore());
break;
case 3:
if (score == null) {
System.out.println("请先输入分数，然后执行该功能");
break;
}
System.out.println("班级最高成绩是：" + highestScore());
break;
case 4:
if (score == null) {
System.out.println("请先输入分数，然后执行该功能");
break;
}
System.out.println("班级最低成绩是：" + lowestScore());
break;
case 5:
if (score == null) {
System.out.println("请先输入分数，然后执行该功能");
break;
}
sortScores();
break;
default:
return;
}
}
}
public static int menu(Scanner scanner){
System.out.println("1.输入学生成绩");
System.out.println("2.获取班级平均成绩");
System.out.println("3.获取班级最高分");
System.out.println("4.获取班级最低分");
System.out.println("5.排序");
System.out.println("6.退出");
int opt = -1;
while (opt == -1) {
System.out.print(">>>请输入选项：");
opt = checkInputNumber(scanner, 1, 6);
}
return opt;
}
public static void input(Scanner scanner){
score = new int[5];
scanner = new Scanner(System.in);
for (int i = 0; i < score.length; i++) {
int tmp = -1;
while (tmp == -1) {
System.out.println("请输入第" + (i+1) + "个成绩:");
tmp = checkInputNumber(scanner,0,100);
}
score[i] = tmp;
}
System.out.println("输入完毕！");
}
public static double avgScore(){
double sum = 0;
for (int i = 0; i < score.length; i++) {
sum += score[i];
}
return sum / score.length;
}
public static int highestScore(){
int max = score[0];
for (int i = 0; i < score.length; i++) {
if(score[i] > max)
max = score[i];
}
return max;
}
public static int lowestScore(){
int min = score[0];
for (int i = 0; i < score.length; i++) {
if(score[i] < min)
min = score[i];
}
return min;
}
public static void sortScores(){
Arrays.sort(score);
System.out.println("学生成绩从高到低依次为:");
for (int i = score.length-1; i >= 0 ; i--) {
System.out.print(score[i] + " ");
}
System.out.println();
}
public static int checkInputNumber(Scanner scanner, int low, int high) {
String input = scanner.next();
try {
int opt = Integer.parseInt(input);
if (opt >= low && opt <= high)
return opt;
else {
System.out.println("输入无效，只能输入" + low + "-" + high);
}
} catch (NumberFormatException e) {
System.out.println("输入无效，只能输入" + low + "-" + high);
}
return -1;
}
}