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TextDouble
0.05 + 0.01 = 0.06
1.0 - 0.42 = 0.58
4.015 * 100 = 401.5
123.3 / 100 = 1.233

X+Y=100200
300=X+Y
第一个加号具有拼接字符串的作用，第二个加号是加法的意思

生成四则运算
import java.util.Random;
import java.util.Scanner;

public class ArithmeticQuiz {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Random random = new Random();

    int totalQuestions = 30;
    int correctAnswers = 0;

    for (int i = 0; i < totalQuestions; i++) {
        // 随机生成两个操作数
        int num1 = random.nextInt(100); // 0-99
        int num2 = random.nextInt(100); // 0-99
        // 随机选择一个运算符
        char operator = getRandomOperator();

        // 计算正确答案
        int correctAnswer = calculate(num1, num2, operator);

        // 提出问题并获取用户输入
        System.out.printf("问题 %d: %d %c %d = ?\n", i + 1, num1, operator, num2);
        System.out.print("请输入你的答案: ");
        int userAnswer = scanner.nextInt();

        // 判断用户答案是否正确
        if (userAnswer == correctAnswer) {
            System.out.println("回答正确！");
            correctAnswers++;
        } else {
            System.out.printf("回答错误！正确答案是: %d\n", correctAnswer);
        }
    }

    // 计算并显示正确率
    double accuracy = (double) correctAnswers / totalQuestions * 100;
    System.out.printf("你的正确率是: %.2f%%\n", accuracy);

    scanner.close();
}

// 随机选择一个运算符
private static char getRandomOperator() {
    char[] operators = {'+', '-', '*', '/'};
    Random random = new Random();
    return operators[random.nextInt(operators.length)];
}

// 计算结果
private static int calculate(int num1, int num2, char operator) {
    switch (operator) {
        case '+':
            return num1 + num2;
        case '-':
            return num1 - num2;
        case '*':
            return num1 * num2;
        case '/':
            // 确保不出现除以零的情况
            return num2 != 0 ? num1 / num2 : num1; // 如果 num2 为 0，返回 num1
        default:
            throw new IllegalArgumentException("未知的运算符: " + operator);
    }
}

}