2020.10.1收获

四则运算

（4）定制是否有乘除法

package day02;

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

public class Test {

	public static void main(String args[]) {

		Random rand = new Random();
		boolean[] bool = new boolean[101];
		String[] fuhao = new String[] { "+", "-", "*", "/" };

		int n = 0;
		int length = 0;
		@SuppressWarnings("resource")
		Scanner scan = new Scanner(System.in);

		System.out.print("您想练习题目的个数为：");
		length = scan.nextInt();

		System.out.print("操作数的个数为：");
		n = scan.nextInt();

		System.out.println("题目中是否出现乘除号：1/0");
		int chengchu = scan.nextInt();
	
		if (chengchu == 1) {

			int[] Number = new int[n];
			String[] Fh = new String[n];

			for (int i = 0; i < length; i++) {
				System.out.print(i + 1 + "、");
				for (int j = 0; j < n; j++) {

					do {
						Number[j] = 1+rand.nextInt(100);
						Fh[j] = String.valueOf(fuhao[rand.nextInt(4)]);

					} while (bool[Number[j]]);

					bool[Number[j]] = true;

					if (j != n - 1) {
						System.out.print(Number[j] + Fh[j]);
					} else {
						System.out.print(Number[j]);
					}
				}
				System.out.println();

			}

		}

		if (chengchu == 0) {

			int[] Number = new int[n];
			String[] Fh = new String[n];

			for (int i = 0; i < length; i++) {
				System.out.print(i + 1 + "、");
				for (int j = 0; j < n; j++) {

					do {
						Number[j] = rand.nextInt(101);
						Fh[j] = String.valueOf(fuhao[rand.nextInt(2)]);

					} while (bool[Number[j]]);

					bool[Number[j]] = true;

					if (j != n - 1) {
						System.out.print(Number[j] + Fh[j]);
					} else {
						System.out.print(Number[j]);
					}
				}
				System.out.println();

			}

		}
	}
}

 

（5） 定制是否有括号（随机插入）

 不会

（6） 定制数值范围

System.out.print("数字的最小值为：");
		int min=scan.nextInt();
		
System.out.print("数字的最大值为：");
		int max=scan.nextInt();
		
.........


Number[j] = rand.nextInt(max+1-min)+min;