课堂测试

#include <iostream>
#include <random>
#include <time.h>

using namespace std;

double f1(double a)
{
    return a / 30;
}

int main()
{
    clock_t start, finish; // 挂钟时间

    double t = 0;
    int f = 0;

    random_device rd;                                            // 用于获得随机种子
    mt19937 gen1(rd());                                          // 以随机种子初始化随机数生成器
    mt19937 gen2(rd());
    mt19937 gen3(rd());
    uniform_int_distribution<int> dist1(10, 99);                 // 生成 [10, 99] 范围内的整数
    uniform_int_distribution<int> dist2(1, 4);                   // 生成 [1, 4] 范围内的整数

    uniform_real_distribution<double> dist3(10.0000000, 99.00000000);
    uniform_real_distribution<double> dist4(1.0000000, 4.000000);

    int a[30] = { 0 };

    for (int i = 0; i < 30; i++)
    {
        int randomNum1, randomNum2, randomNum3, n;

        do
        {
            randomNum1 = dist1(gen1); // 生成随机数
            randomNum2 = dist1(gen2);
            randomNum3 = dist2(gen3);
        } while (randomNum1 == randomNum2);

        double GameTime = 1000; // 游戏时间
        double gametime;        // 用户所用时间

        if (randomNum3 == 1)
        {
            n = randomNum1 + randomNum2;
            cout << i + 1 << " " << randomNum1;
            cout << "+";
            cout << randomNum2 << "=" << endl;
        }

        if (randomNum3 == 2)
        {
            n = randomNum1 - randomNum2;
            if (n < 0)
            {
                cout << i + 1 << " " << randomNum2;
                cout << "-";
                cout << randomNum1 << "=" << endl;
                n = randomNum2 - randomNum1;
            }
            else
            {
                cout << i + 1 << " " << randomNum1;
                cout << "-";
                cout << randomNum2 << "=" << endl;
                n = randomNum1 - randomNum2;
            }
        }

        if (randomNum3 == 3)
        {
            n = randomNum1 * randomNum2;

            while (n >= 1000)
            {
                n = randomNum1 * randomNum2;
                randomNum1--;
                randomNum2--;
            }

            n = randomNum1 * randomNum2;
            cout << i + 1 << " " << randomNum1;
            cout << "*";
            cout << randomNum2 << "=" << endl;
        }

        if (randomNum3 == 4)
        {
            do
            {
                randomNum1 = dist3(gen1); // 生成随机数
                randomNum2 = dist4(gen2);
            } while (randomNum1 % randomNum2 != 0 && randomNum1 < randomNum2 && randomNum1 != 0 && randomNum2 != 0);

            n = randomNum1 / randomNum2;

            cout << i + 1 << " " << randomNum1 << "/" << randomNum2 << "=" << endl;
        }

       

        start = clock();

        cin >> a[i];

        finish = clock();

        gametime = (double)(finish - start) / CLOCKS_PER_SEC;

        if (gametime >= GameTime)
        {
            cout << "很遗憾，未能在规定时间内得出答案   正确结果" << n << endl;
            f++;
            continue;
        }

        if (a[i] == n)
        {
            cout << "true" << endl;
            t++;
        }
        else
        {
            cout << "false  正确结果 " << n << endl;
            f++;
        }
    }

    cout << "错题数：" << f << endl;
    cout << "正确率：" << f1(t) << endl;

    return 0;
}

　　

import java.util.Random;
import java.util.Scanner;

public class Main {
    public static double f1(double a) {
        return a / 30;
    }

    public static void main(String[] args) {
        long start, finish; // 挂钟时间

        double t = 0;
        int f = 0;

        Random rd = new Random(); // 用于获得随机种子

        int[] a = new int[30];

        for (int i = 0; i < 30; i++) {
            int randomNum1, randomNum2, randomNum3, n;

            do {
                randomNum1 = rd.nextInt(90) + 10; // 生成随机数
                randomNum2 = rd.nextInt(90) + 10;
                randomNum3 = rd.nextInt(4) + 1;
            } while (randomNum1 == randomNum2);

            double GameTime = 1000; // 游戏时间
            double gametime; // 用户所用时间

            if (randomNum3 == 1) {
                n = randomNum1 + randomNum2;
                System.out.print((i + 1) + " " + randomNum1);
                System.out.print("+");
                System.out.println(randomNum2 + "=");
            }

            if (randomNum3 == 2) {
                n = randomNum1 - randomNum2;
                if (n < 0) {
                    System.out.print((i + 1) + " " + randomNum2);
                    System.out.print("-");
                    System.out.println(randomNum1 + "=");
                    n = randomNum2 - randomNum1;
                } else {
                    System.out.print((i + 1) + " " + randomNum1);
                    System.out.print("-");
                    System.out.println(randomNum2 + "=");
                    n = randomNum1 - randomNum2;
                }
            }

            if (randomNum3 == 3) {
                n = randomNum1 * randomNum2;

                while (n >= 1000) {
                    n = randomNum1 * randomNum2;
                    randomNum1--;
                    randomNum2--;
                }

                n = randomNum1 * randomNum2;
                System.out.print((i + 1) + " " + randomNum1);
                System.out.print("*");
                System.out.println(randomNum2 + "=");
            }

            if (randomNum3 == 4) {
                do {
                    randomNum1 = rd.nextInt(90) + 10; // 生成随机数
                    randomNum2 = rd.nextInt(3) + 1;
                } while (randomNum1 % randomNum2 != 0 && randomNum1 < randomNum2 && randomNum1 != 0 && randomNum2 != 0);

                n = randomNum1 / randomNum2;

                System.out.println((i + 1) + " " + randomNum1 + "/" + randomNum2 + "=");
            }

            start = System.nanoTime();

            Scanner scanner = new Scanner(System.in);
            a[i] = scanner.nextInt();

            finish = System.nanoTime();

            gametime = (double) (finish - start) / 1_000_000_000;

            if (gametime >= GameTime) {
                System.out.println("很遗憾，未能在规定时间内得出答案   正确结果 " + n);
                f++;
                continue;
            }

            if (a[i] == n) {
                System.out.println("true");
                t++;
            } else {
                System.out.println("false  正确结果 " + n);
                f++;
            }
        }

        System.out.println("错题数：" + f);
        System.out.println("正确率：" + f1(t));
    }
}

　　课堂上写的C++,回来改成java了。

　　因为就生成30个随机题目，不需要保证题目不重复。因为可能性太低了，如果一定要，会浪费大量时间，所以我在此删去了这段代码