Java编程（写出程序代码）

import java.util.Scanner

/*输入一个成绩，将该成绩转换为A、B、C、D和E：成绩在90分以上，结果为A，成绩在80-90之间纤裤，结果为B，成绩在70-80之间，结果为C，成绩在60-70之间，结果为D，庆敏成绩在60分以下，结果为E。*/

public class Chengfabiao

{

public static void main (String[] args)

{

Scanner scanner 誉竖枝= new Scanner(System.in)

int score = scanner.nextInt()

if(score>90)

{

System.out.println("A")

}

else if(score>=80)

{

System.out.println("B")

}

else if(score>=70)

{

System.out.println("C")

}

else if(score>=60)

{

System.out.println("D")

}

else

{

System.out.println("E")

}

}

}

import java.util.Random

import java.util.Scanner

public class T {

public static void main(String[] args) throws Exception {

Scanner in = new Scanner(System.in)

int difficulty//难度

int mode//运算类型

int answer//答案

int amount//挑战题目数量橘伍

int score = 0//得分

System.out.println("请输入难度（1：一位数、2：圆腊或两位数、3：局尺三位数）：")

difficulty = in.nextInt()

System.out.println("请输入运算类型（1：加、2：减、3：乘、4：除）：")

mode = in.nextInt()

System.out.println("请输入想要挑战的题目数量：")

amount = in.nextInt()

Random random = new Random()

for (int i = 0i <amounti++) {

if (difficulty == 1) {

if (mode == 1) {

int x = random.nextInt(10)

int y = random.nextInt(10)

System.out.println("第" + i + "题：")

System.out.print(x + " + " + y + " = ")

answer = in.nextInt()

if (answer == (x + y)) {

System.out.println("答对了\n")

score++

} else {

System.out.println("答错了，答案是：" + (x + y) + "\n")

}

} else if (mode == 2) {

int x = random.nextInt(10)

int y = random.nextInt(10)

System.out.println("第" + i + "题：")

System.out.print(x + " - " + y + " = ")

answer = in.nextInt()

if (answer == (x - y)) {

System.out.println("答对了\n")

score++

} else {

System.out.println("答错了，答案是：" + (x - y) + "\n")

}

} else if (mode == 3) {//乘法

} else if (mode == 4) {//除法 考虑小数的问题

} else {

throw new Exception("运算类型输入值不合法")

}

} else if (difficulty == 2) {

if (mode == 1) {

int x = random.nextInt(100)

int y = random.nextInt(100)

System.out.println("第" + i + "题：")

System.out.print(x + " + " + y + " = ")

answer = in.nextInt()

if (answer == (x + y)) {

System.out.println("答对了\n")

score++

} else {

System.out.println("答错了，答案是：" + (x + y) + "\n")

}

} else if (mode == 2) {

} else if (mode == 3) {//乘法

} else if (mode == 4) {//除法 考虑小数的问题

} else {

throw new Exception("运算类型输入值不合法")

}

} else if (difficulty == 3) {

if (mode == 1) {

int x = random.nextInt(1000)

int y = random.nextInt(1000)

System.out.println("第" + i + "题：")

System.out.print(x + " + " + y + " = ")

answer = in.nextInt()

if (answer == (x + y)) {

System.out.println("答对了\n")

score++

} else {

System.out.println("答错了，答案是：" + (x + y) + "\n")

}

} else if (mode == 2) {

} else if (mode == 3) {//乘法

} else if (mode == 4) {//除法 考虑小数的问题

} else {

throw new Exception("运算类型输入值不合法")

}

} else {

throw new Exception("难度输入值不合法")

}

}

System.out.println("挑战结束，您的分数为：" + score)

}

}

我就只举了加法的例子，其他运算的写法都是类似的，你照葫芦画瓢即可

运行结果：

public class Test {

    public static void main(String[] args) {

        // 定义数组

        int[][] array = new int[5][6]

        // 生成随机数初始化数组

        for (int i = 0 i < array.length i++) {

            for (int j = 0 j < array[i].length j++) {

                拆闹array[i][j] = (int) (40 * Math.random()) + 10

            }

        }

      旅拿罩  敏戚// 输出数组

        for (int i = 0 i < array.length i++) {

            for (int j = 0 j < array[i].length j++) {

                System.out.print(array[i][j] + "\t")

            }

            System.out.println() // 换行

        }

    }

}

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