2020年10月3日Java学习日记

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;