四则运算2

#include<iostream>
#include<stdio.h>
#include<time.h>
#include<fstream>
using namespace std;

int main()
{
    ofstream outfile;
    int i, a, b, c, d, e, f, g, l, m, o, x, y, z;
    int number, muldiv, rnum, numf, neg, rem; //muldiv判断乘除,rnum判断随机数,numf数值范围,neg判断有无负数,rem判断有无余数
    char psign, msign; //符号正负
    int bra, braran;      //bra判断是否有括号
    int num, signnum;  //num数字个数,signnum符号个数
    int numarray[20]; //szsz数字数组
    char fh[4] = { '+', '-', '*', '/' }, signarray[10];//fhsz符号数组
    cout << "请输入要打印的数量:";
    cin >> number;
    cout << "请输入数值范围：0-";
    cin >> numf;
    cout << "是否有括号：  1、有  2、无  ：";
    cin >> bra;
    cout << "加减有无负数： 1、有  2、无 :";
    cin >> neg;
    cout << "是否有乘除法： 1、有  2、无 :";
    cin >> muldiv;
    if (muldiv == 1)
    {
        cout << "除法有无余数: 1、有  2、无 :";
        cin >> rem;
    }
    srand((unsigned)time(NULL));//时间种子，每次出现随机数不同

    if (bra == 1)     //判断是否有括号
    {
        braran = 3;
    }
    if (bra == 2)
    {
        braran = 2;
    }

    if (muldiv == 1)           //判断是否有乘除
    {
        rnum = 4;
    }
    if (muldiv == 2)
    {
        rnum = 2;
    }
    for (i = 0; i < number; i++)
    {

        a = rand() % numf;
        b = rand() % numf;
        e = rand() % numf;
        f = rand() % numf;
        if (neg == 1)
        {
            l = rand() % 2;
            m = rand() % 2;
            if (l == 0)          //加减有负数时，随机生成正负号
            {
                psign = '-';
            }
            if (l == 1)
            {
                psign = ' ';
            }
            if (m == 0)
            {
                msign = '-';
            }
            if (m == 1)
            {
                msign = ' ';
            }
        }
        else
        {
            psign = msign = ' ';
        }
        switch (d = rand() % braran)
            {
            case 0:   //整数
            {
                          switch (c = rand() % rnum)
                          {
                          case 0:cout << psign << a << "+" << msign << b << "=" << endl; break;
                          case 1:cout << psign << a << "-" << msign << b << "=" << endl; break;
                          case 2:cout << a << "×" << b << "=" << endl; break;
                          case 3:
                          {
                                    if (rem == 2)
                                    {
                                        while (b == 0)
                                        {
                                            b = rand() % numf;
                                        }
                                        o = a%b;
                                        while (o != 0)
                                        {
                                            b = rand() % numf;
                                            while (b == 0)
                                            {
                                                a = rand() % numf;
                                                b = rand() % numf;
                                            }
                                            o = a%b;
                                        }
                                    }
                                    else
                                    {
                                        while (b == 0)
                                        {
                                            b = rand() % numf;
                                        }
                                    }
                                    cout << a << "÷" << b << "=" << endl;
                          }break;
                          }
            }break;
            case 1://真分数
            {
                       while (a == 0 || b == 0 || a >= b)
                       {
                           a = rand() % numf;
                           b = rand() % numf;
                       }
                       while (e == 0 || f == 0 || e >= f)
                       {
                           e = rand() % numf;
                           f = rand() % numf;
                       }
                       switch (g = rand() % rnum)
                       {
                       case 0: cout << psign << a << "/" << b << "+" << msign << e << "/" << f << "=" << endl; break;
                       case 1: cout << psign << a << "/" << b << "-" << msign << e << "/" << f << "=" << endl; break;
                       case 2: cout << a << "/" << b << "×" << e << "/" << f << "=" << endl; break;
                       case 3: cout << a << "/" << b << "÷" << e << "/" << f << "=" << endl;
                       }break;
            }break;
            case 2:
            {
                      num = 3 + rand() % 8;     //有括号时，数字和符号数组
                      signnum = num - 1;
                      for (y = 0; y < num; y++)
                      {
                          numarray[y] = rand() % numf;
                      }
                      for (y = 0; y < signnum; y++)
                      {
                          x = rand() % 4;
                          signarray[y] = fh[x];
                      }
                      signarray[signnum] = '=';
                      switch (z = signnum % 2)
                      {
                      case 0:
                      {
                                cout << numarray[0];
                                cout << signarray[0];
                                for (y = 1; y < signnum; y++)
                                {
                                    cout << "(";
                                    cout << numarray[y];
                                    cout << signarray[y];
                                    cout << numarray[y + 1];
                                    cout << ")";
                                    cout << signarray[y + 1];
                                    y = y + 1;
                                }cout << endl;
                      }break;
                      case 1:
                      {
                                for (y = 0; y < signnum; y++)
                                {
                                    cout << "(";
                                    cout << numarray[y];
                                    cout << signarray[y];
                                    cout << numarray[y + 1];
                                    cout << ")";
                                    cout << signarray[y + 1];
                                    y = y + 1;
                                }
                                cout << endl;
                      }break;
                      }
            }break;
            }
        }
    }

本次作业的题目：

老师又给二柱子增加了几个条件，对程序再做进一步的改进，要求满足如下条件：

1.题目避免重复。

2.可制定。（数量/打印方式）

3.可以控制下列参数：

· 是否有乘除法

· 是否有括号（最多可支持10个数参与计算）

· 数值范围

· 加减有无负数

· 乘除有无余数

设计思想：  

    这次的内容有点多，而且个别功能有点难度，我没有把握全部实现，只能从最容易完成的功能入手，这次程序在第一次的基础上完成的，主要构建的功能如下

    1.利用循环可指定输出的题目数量

    2.分类乘除法与加减法

    3.在乘除法中，判断条件，余数为0，得到整除的除法式子

    4.在加减法中设置条件，使减数不小于被减数，得到的结果不为负数

    5.利用循环嵌套结构