20194581自动生成四则运算第一版报告

public String[][] CreateQuestion(int num, boolean is_include_Multiplication_division, int size_operationNum,
			boolean is_include_negative) {
		int num1, num2, result;
		int type;
		int count = 0;
		String[][] Question_Answer = new String[99999][2];
		while (true) {
			if (count >= num)
				break;
			if (is_include_negative) {
				num1 = (int) ((Math.random() * size_operationNum) - 50);
				num2 = (int) ((Math.random() * size_operationNum) - 50);
			} else {
				num1 = (int) (Math.random() * size_operationNum);
				num2 = (int) (Math.random() * size_operationNum);
			}
			if (!is_include_negative)
				if (num1 < 0 || num2 < 0)
					continue;
			type = 1 + (int) (Math.random() * 4);
			if (type == 1) {
				result = num1 + num2;
				if (result < 100) {
					Question_Answer[count][0] = "("+num1+")" + " + " +"("+ num2+")" + " =";
					Question_Answer[count][1] = result+"";
					count++;
				}
			} else if (type == 2) {
				result = num1 - num2;
				if (result < 100) {
					Question_Answer[count][0] = "("+num1+")" + " - " +"("+ num2+")" + " =";
					Question_Answer[count][1] = result+"";
					count++;
				}
			} else if (type == 3 && is_include_Multiplication_division) {
				result = num1 * num2;
				if (result < 100) {
					Question_Answer[count][0] = "("+num1+")" + " × " +"("+ num2+")" + " =";
					Question_Answer[count][1] = result+"";
					count++;
				}
			} else if (type == 4 && is_include_Multiplication_division) {
				Double result_;
				if (num2 == 0)
					continue;
				result_ = (double) num1 / num2;
				if (result_ < 100) {
					Question_Answer[count][0] = "("+num1+")" + " ÷ " +"("+ num2+")" + " =";
					Question_Answer[count][1] = String.format("%.2f", result_); // 精度控制
					count++;
				}
			}
		}
		return Question_Answer;
	}

	/*
	 * rows控制输出列
	 */
	public void SaveToDisk(String[][] question_answer, int lines, int rows) {
		// 定义输入输出类对象
		OutputStream outputStream = null;
		// 获取时间，用于生成随时间变化的文件名
		LocalDate date = LocalDate.now();
		// 创建result.txt文件
		try {
			outputStream = new FileOutputStream("./result" + date + ".txt");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}



	public static void main(String[] args) {
		Question_ q = new Question_();
		int num = 10;
		int size_operationNum = 100;
		boolean is_include_Multiplication_division = false;
		boolean is_include_negative = false;
		Scanner input = new Scanner(System.in);

		int rows = 1;
		System.out.print("请输入100~1000的自然数");
		size_operationNum = input.nextInt();

		System.out.print("请输入要产生的题数");
		num = input.nextInt();

		System.out.print("若有乘除输入1，若无乘除输入0");
		int flag = input.nextInt();
		if (flag == 1)
			is_include_Multiplication_division = true;
		else
			is_include_Multiplication_division = false;

		System.out.print("若有负数输入1，若无负数输入0");
		flag = input.nextInt();
		if (flag == 1)
			is_include_negative = true;
		else
			is_include_negative = false;

		System.out.print("打印行数（默认为1行）：");
		rows = input.nextInt();

		String[][] question_answer = q.CreateQuestion(num, is_include_Multiplication_division, size_operationNum,
				is_include_negative);
		int size = q.Question_Size(question_answer);