using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 新四则运算
{public partial class 新四则运算 : Form{public 新四则运算(){InitializeComponent();}char[] ysf = { '+', '-', '*', '%'};static int GetRandomSeed()  //随机数种子，解决随机数一致问题
        {byte[] bytes = new byte[4];System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();rng.GetBytes(bytes);return BitConverter.ToInt32(bytes, 0);}private void btn_1_Click(object sender, EventArgs e){int n = Convert.ToInt32(this.tbox_n.Text);  //获取生成题目数int r = Convert.ToInt32(this.tbox_r.Text);  //获取生成数范围int ysf = Convert.ToInt32(this.cbox_ysf.Text.ToString());  //获取运算符个数for(int i = 0; i < n; i++) //生成n道题
            {if (ysf == 1)  //一个运算符
                {ysf1(r); }else if (ysf == 2)  // 两个运算符
                {ysf2(r);}else    //三个运算符
                {ysf3(r);}input(" = ");input("\n");input("\n");}}public void ysf1(int r)   //一个运算符
        {if(cbox_fs.SelectedItem.ToString() == "是")   //包含分数
            {Random rd = new Random(GetRandomSeed());randnum1(r);  //插入随机数，可以是分数input_ysf();  //插入运算符
                randnum1(r);}else{Random rd = new Random(GetRandomSeed());randnum(r); //插入整数随机数
                input_ysf();randnum(r);}}public void ysf2(int r){Random rd = new Random(GetRandomSeed());int t = 0;t = rd.Next(2); //随机运算符数量，1或2，对零时变量t随机，结果为0，跳至ysf1，结果为1则为ysf2if (t == 0){ysf1(r);}else{if(cbox_kh.SelectedItem.ToString() == "是")  //包含括号
                {input_ysf2_kh(r);  }else{input_ysf2(r); }}}public void ysf3(int r){Random rd = new Random(GetRandomSeed());int t = 0;t = rd.Next(2); //随机运算符数量，对零时变量t随机，结果为0，跳至ysf2，结果为1则为ysf3if (t == 0){ysf2(r);}else{if (cbox_kh.SelectedItem.ToString() == "是")  //包含括号
                {int m = 0;m = rd.Next(3); //对加括号的形式进行随机if(m == 0){input_ysf3_kh1(r);  //括号形式1
                    }else if(m == 1){input_ysf3_kh2(r);   //括号形式2
                    }else{input_ysf3_kh3(r);  //括号形式3
                    }                       }else{input_ysf3(r);   //不含括号
                }}}public void input_ysf(){input(" "); //运算符前后空格Random rd = new Random(GetRandomSeed());if (cbox_ccf.SelectedItem.ToString() == "是") {input(ysf[rd.Next(4)].ToString());//包含乘除法
            }else{input(ysf[rd.Next(2)].ToString());//不含乘除法
            }input(" ");}public void input_ysf2(int r){if(cbox_fs.SelectedItem.ToString() == "是")  //判断是否含分数
            {randnum1(r);   input_ysf();randnum1(r);input_ysf();randnum1(r);}else{randnum(r);  input_ysf();randnum(r);input_ysf();randnum(r);}}public void input_ysf2_kh(int r){if (cbox_fs.SelectedItem.ToString() == "是") //含分数
            {input("(");randnum1(r);input_ysf();randnum1(r);input(")");input_ysf();randnum1(r);}else{input("(");randnum(r);input_ysf();randnum(r);input(")");input_ysf();randnum(r);}}public void input_ysf3(int r){if (cbox_fs.SelectedItem.ToString() == "是")  //含分数
            {randnum1(r);input_ysf();randnum1(r);input_ysf();randnum1(r);input_ysf();randnum1(r);}else{randnum(r);input_ysf();randnum(r);input_ysf();randnum(r);input_ysf();randnum(r);}}public void input_ysf3_kh1(int r)  //带括号形式1
        {if (cbox_fs.SelectedItem.ToString() == "是"){input("[");input("(");randnum1(r);input_ysf();randnum1(r);input(")");input_ysf();randnum1(r);input("]");input_ysf();randnum1(r);}else{input("[");input("(");randnum(r);input_ysf();randnum(r);input(")");input_ysf();randnum(r);input("]");input_ysf();randnum(r);}}public void input_ysf3_kh2(int r)  //带括号形式2
        {if (cbox_fs.SelectedItem.ToString() == "是"){randnum1(r);input_ysf();input("(");randnum1(r);input_ysf();randnum1(r);input(")");input_ysf();randnum1(r);}else{randnum(r);input_ysf();input("(");randnum(r);input_ysf();randnum(r);input(")");input_ysf();randnum(r);}}public void input_ysf3_kh3(int r)  //带括号形式3
        {if (cbox_fs.SelectedItem.ToString() == "是"){input("(");randnum1(r);input_ysf();randnum1(r);input(")");input_ysf();input("(");randnum1(r);input_ysf();randnum1(r);input(")");}else{input("(");randnum(r);input_ysf();randnum(r);input(")");input_ysf();input("(");randnum(r);input_ysf();randnum(r);input(")");}}public void randnum(int r) //对数进行随机，只能是整数
        {Random rd = new Random(GetRandomSeed());int num;do{num = rd.Next(r + 1);} while (num == 0); // 随机整数不为 0
input(num.ToString());}public void randnum1(int r) //对数进行随机，可为分数
        {int t = 0;Random rd = new Random(GetRandomSeed());t = rd.Next(2); //对零时变量t随机，结果为0，这个数为整数，结果为1则为分数if (t == 0){int num;do{num = rd.Next(r + 1);} while (num == 0); // 随机整数不为 0
input(num.ToString());}else{randnum2(r);}}public void randnum2(int r) //分数随机
        {Random rd = new Random(GetRandomSeed());int x, y; //x为分子，y为分母do{x = rd.Next(r + 1);} while (x == 0); //分子不为0do{y = rd.Next(r + 1);} while (y == 0 || y == x); //分母不为0，且不等于分子if (x > y) //如果分子比分母大，则对调分子分母位置
            {int t = x;x = y;y = t;}input(x.ToString());input("/");input(y.ToString());}public void input(string t){tbox_shuchu.AppendText(t);}private void btn_clc_Click(object sender, EventArgs e){tbox_shuchu.Clear();}}
}