11.1学习总结

import java.io.FileWriter;
import java.io.IOException;
import java.util.HashSet;
import java.util.Random;
import java.util.Scanner;
import java.util.Set;

public class MathExerciseGenerator {
    public static void main(String[] args) {
        int numExercises = 50; // 修改为所需的题目数量
        System.out.println("欢迎来到口算题卡系统");
        System.out.println("请输入生成题目数量！");
        Scanner scanner = new Scanner(System.in);
        numExercises = scanner.nextInt();
        int range = 100;  // 最大数字范围
        System.out.println("请输入生成数字最大范围！");
        range= scanner.nextInt();
        System.out.println("下面开始作答。");

        generateMathExercises(numExercises, range);
    }

    private static void generateMathExercises(int numExercises, int range) {
        try {
            FileWriter csvWriter = new FileWriter("math_exercises.csv");

            Set<String> exercises = new HashSet<>();
            Random random = new Random();

            while (exercises.size() < numExercises) {
                int num1 = random.nextInt(range) + 1;
                int num2 = random.nextInt(range) + 1;
                char operator = "+-*/".charAt(random.nextInt(4));

                String exercise = num1 + " " + operator + " " + num2;

                if (operator == '/' && num1 % num2 != 0) {
                    // Skip divisions that result in decimals
                    continue;
                }
                if (exercises.contains(exercise)) {
                    // Skip duplicate exercises
                    continue;
                }
                exercises.add(exercise);

                // Write the exercise to the CSV file
                csvWriter.append(exercise + "\n");
            }

            csvWriter.flush();
            csvWriter.close();
            System.out.println("题目已保存在exercises.csv中");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}